Minor code cleanup

Marlin/src/feature/pause.cpp

       #endif
 
       // Keep looping if "Purge More" was selected
-    } while (
+    } while (false
       #if HAS_LCD_MENU
-        show_lcd && advanced_pause_menu_response == ADVANCED_PAUSE_RESPONSE_EXTRUDE_MORE
-      #else
-        0
+        && show_lcd && advanced_pause_menu_response == ADVANCED_PAUSE_RESPONSE_EXTRUDE_MORE
       #endif
     );