Consistent heating status and status reset

Fix #10699

Marlin/src/Marlin.cpp

   #endif
 
   lcd_init();
-  LCD_MESSAGEPGM(WELCOME_MSG);
+  lcd_reset_status();
 
   #if ENABLED(SHOW_BOOTSCREEN)
     lcd_bootscreen();

Marlin/src/gcode/control/M80_M81.cpp

     #endif
 
     #if ENABLED(ULTIPANEL)
-      LCD_MESSAGEPGM(WELCOME_MSG);
+      lcd_reset_status();
     #endif
   }
 

Marlin/src/gcode/temperature/M104_M109.cpp

        * standby mode, for instance in a dual extruder setup, without affecting
        * the running print timer.
        */
-      if (parser.value_celsius() <= (EXTRUDE_MINTEMP) / 2) {
+      if (temp <= (EXTRUDE_MINTEMP) / 2) {
         print_job_timer.stop();
-        LCD_MESSAGEPGM(WELCOME_MSG);
+        lcd_reset_status();
       }
     #endif
-
-    #if ENABLED(ULTRA_LCD)
-      if (parser.value_celsius() > thermalManager.degHotend(e))
-        #if HOTENDS > 1
-          lcd_status_printf_P(0, PSTR("E%i " MSG_HEATING), e + 1);
-        #else
-          LCD_MESSAGEPGM("E " MSG_HEATING);
-        #endif
-    #endif
   }
 
   #if ENABLED(AUTOTEMP)
        */
       if (parser.value_celsius() <= (EXTRUDE_MINTEMP) / 2) {
         print_job_timer.stop();
-        LCD_MESSAGEPGM(WELCOME_MSG);
+        lcd_reset_status();
       }
       else
         print_job_timer.start();