Fix typo/bit-math-fail in kHitachiAc1Auto value.

* Use `0bxxxx` notation so I don't make the same mistake for the rest of 
the modes,

Ref: 
#1056 (comment)

src/ir_Hitachi.h

@@ -91,11 +91,11 @@ const uint8_t kHitachiAc1ModelSize = 2;
 const uint8_t kHitachiAc1ModeByte = 5;
 const uint8_t kHitachiAc1ModeOffset = 4;
 const uint8_t kHitachiAc1ModeSize = 4;  // Mask 0b11110000
-const uint8_t kHitachiAc1Dry = 2;            // 0b0010
-const uint8_t kHitachiAc1Fan = 4;            // 0b0100
-const uint8_t kHitachiAc1Cool = 6;           // 0b0110
-const uint8_t kHitachiAc1Heat = 9;           // 0b1001
-const uint8_t kHitachiAc1Auto = 15;          // 0b1110
+const uint8_t kHitachiAc1Dry =                  0b0010;  // 2
+const uint8_t kHitachiAc1Fan =                  0b0100;  // 4
+const uint8_t kHitachiAc1Cool =                 0b0110;  // 6
+const uint8_t kHitachiAc1Heat =                 0b1001;  // 9
+const uint8_t kHitachiAc1Auto =                 0b1110;  // 14
 const uint8_t kHitachiAc1FanByte = kHitachiAc1ModeByte;
 const uint8_t kHitachiAc1FanOffset = 0;
 const uint8_t kHitachiAc1FanSize = 4;  // Mask 0b0001111

test/IRac_test.cpp

@@ -637,7 +637,7 @@ TEST(TestIRac, Hitachi1) {
   IRrecv capture(kGpioUnused);
   char expected[] =
       "Model: 1 (R-LT0541-HTA-A), Power: On, Power Toggle: Off, "
-      "Mode: 15 (Auto), Temp: 19C, Fan: 4 (Medium), "
+      "Mode: 14 (Auto), Temp: 19C, Fan: 4 (Medium), "
       "Swing(V) Toggle: On, Swing(V): On, Swing(H): On, Sleep: 2, "
       "On Timer: Off, Off Timer: Off";