Merge pull request MarlinFirmware#4123 from gudnimg/improve-mmu-status

Minor UI fixes for MMU status line during toolchange

Firmware/mmu2_reporting.cpp

@@ -20,7 +20,9 @@ void BeginReport(CommandInProgress /*cip*/, uint16_t ec) {
 
 void EndReport(CommandInProgress /*cip*/, uint16_t /*ec*/) {
     // clear the status msg line - let the printed filename get visible again
-    lcd_setstatuspgm(MSG_WELCOME); // should be seen only when the printer is not printing a file
+    if (!printJobOngoing()) {
+        lcd_setstatuspgm(MSG_WELCOME);
+    }
     custom_message_type = CustomMsg::Status;
 }
 
@@ -270,11 +272,6 @@ void ReportProgressHook(CommandInProgress cip, uint16_t ec) {
     if (cip != CommandInProgress::NoCommand) {
         custom_message_type = CustomMsg::MMUProgress;
         lcd_setstatuspgm( _T(ProgressCodeToText(ec)) );
-    } else {
-        // If there is no command in progress we can display other
-        // useful information such as the name of the SD file 
-        // being printed
-        custom_message_type = CustomMsg::Status;
     }
 }