Fix up serial sanity check

Marlin/src/module/configuration_store.cpp

@@ -262,7 +262,7 @@ void MarlinSettings::postprocess() {
   #if ENABLED(FWRETRACT)
     fwretract.refresh_autoretract();
   #endif
- 
+
   // Refresh steps_to_mm with the reciprocal of axis_steps_per_mm
   // and init stepper.count[], planner.position[] with current_position
   planner.refresh_positioning();