Merge pull request #338 from XPila/RELEASE-4.0.5

fix - crash after tune button/printing_serial clicked (BFW-731)

src/gui/screen_printing_serial.cpp

@@ -144,7 +144,7 @@ int screen_printing_serial_event(screen_t *screen, window_t *window, uint8_t eve
     if (event == WINDOW_EVENT_BTN_DN) {
         screen_open(pscreen_menu_tune->id);
         lock = 0;
-        return 0; //here MUST BE return. Screen is no longer valid.
+        return 1; //here MUST BE return 1. Screen is no longer valid.
     }
 
     int now = HAL_GetTick();