Increase ignore time after setting standby/sleep mode to 500ms

250ms was too low, it would usually come back into run mode when
releasing the button.

Drivers/graphics/gui/screens/main_screen.c

@@ -427,7 +427,7 @@ int main_screenProcessInput(screen_t * scr, RE_Rotation_t input, RE_State_t *sta
 
   // If at main temperature screen
   if(mainScr.currentMode == main_irontemp && (input == Rotate_Increment || input == Rotate_Decrement || input == Click)){
-    if(getIronWakeSource()==wakeSrc_Button && !checkIronModeTimer(250)){  // To avoid unwanted mode changing, ignore action if iron mode was set <250ms ago
+    if(getIronWakeSource()==wakeSrc_Button && !checkIronModeTimer(500)){  // To avoid unwanted mode change, ignore action if iron mode was set <500ms ago
         input = Rotate_Nothing;
       }
       else if(currentIronMode==mode_boost){                               // If iron in boost mode, return to normal mode, don't process the input