Merge pull request #5577 from manianac/RCBugFix-M600Dryrun

Allow M600 when dryrun debugging

Marlin/Marlin_main.cpp

    */
   inline void gcode_M600() {
 
-    if (thermalManager.tooColdToExtrude(active_extruder)) {
+    if (!DEBUGGING(DRYRUN) && thermalManager.tooColdToExtrude(active_extruder)) {
       SERIAL_ERROR_START;
       SERIAL_ERRORLNPGM(MSG_TOO_COLD_FOR_M600);
       return;

Marlin/ultralcd.cpp

 
   #if ENABLED(FILAMENT_CHANGE_FEATURE)
     void lcd_enqueue_filament_change() {
-      if (thermalManager.tooColdToExtrude(active_extruder)) {
+      if (!DEBUGGING(DRYRUN) && thermalManager.tooColdToExtrude(active_extruder)) {
         lcd_save_previous_screen();
         lcd_goto_screen(lcd_filament_change_toocold_menu);
         return;