Follow-up the PR #4278 (Fixups for PID_ADD_EXTRUSION_RATE and HOTENDS==1)

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Follow-up the PR #4278 (Fixups for PID_ADD_EXTRUSION_RATE and HOTENDS==1)

PR #4278 (Fixups for PID_ADD_EXTRUSION_RATE and HOTENDS==1) causes compilation errors and warning
when PIDTEMP and PID_PARAMS_PER_HOTEND are enabled and HOTENDS == 1.

error message

temperature.cpp:72: error: conflicting declaration 'float Temperature::Kp [1]'

     float Temperature::Kp[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kp),

                                  ^

In file included from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\buzzer.h:28:0,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\Marlin.h:386,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\temperature.cpp:27:

temperature.h:88: error: 'Temperature::Kp' has a previous declaration as 'float Temperature::Kp'

         static float Kp, Ki, Kd;

                      ^

temperature.cpp:72: error: declaration of 'float Temperature::Kp' outside of class is not definition [-fpermissive]

     float Temperature::Kp[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kp),

                                  ^

temperature.cpp:73: error: conflicting declaration 'float Temperature::Ki [1]'

           Temperature::Ki[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Ki) * (PID_dT)),

                                  ^

In file included from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\buzzer.h:28:0,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\Marlin.h:386,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\temperature.cpp:27:

temperature.h:88: error: 'Temperature::Ki' has a previous declaration as 'float Temperature::Ki'

         static float Kp, Ki, Kd;

                          ^

temperature.cpp:73: error: declaration of 'float Temperature::Ki' outside of class is not definition [-fpermissive]

           Temperature::Ki[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Ki) * (PID_dT)),

                                  ^

temperature.cpp:74: error: conflicting declaration 'float Temperature::Kd [1]'

           Temperature::Kd[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Kd) / (PID_dT));

                                  ^

In file included from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\buzzer.h:28:0,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\Marlin.h:386,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\temperature.cpp:27:

temperature.h:88: error: 'Temperature::Kd' has a previous declaration as 'float Temperature::Kd'

         static float Kp, Ki, Kd;

                              ^

temperature.cpp:74: error: declaration of 'float Temperature::Kd' outside of class is not definition [-fpermissive]

           Temperature::Kd[HOTENDS] = ARRAY_BY_HOTENDS1((DEFAULT_Kd) / (PID_dT));

                                  ^

temperature.cpp:76: error: conflicting declaration 'float Temperature::Kc [1]'

       float Temperature::Kc[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kc);

                                    ^

In file included from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\buzzer.h:28:0,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\Marlin.h:386,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\temperature.cpp:27:

temperature.h:90: error: 'Temperature::Kc' has a previous declaration as 'float Temperature::Kc'

           static float Kc;

                        ^

temperature.cpp:76: error: declaration of 'float Temperature::Kc' outside of class is not definition [-fpermissive]

       float Temperature::Kc[HOTENDS] = ARRAY_BY_HOTENDS1(DEFAULT_Kc);

                                    ^

warning message

In file included from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\buzzer.h:28:0,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\Marlin.h:386,

                 from AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\configuration_store.cpp:128:

AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\configuration_store.cpp: In function 'void Config_ResetDefault()':

AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\temperature.h:42:39: warning: unused variable 'e' [-Wunused-variable]

   #define HOTEND_LOOP() const uint8_t e = 0;

                                       ^

AppData\Local\Temp\build6674025c445f92d0b07185e4e4080804.tmp\sketch\configuration_store.cpp:621:7: note: in expansion of macro 'HOTEND_LOOP'

       HOTEND_LOOP()

       ^