ios: remove incorrect handling of window state change

The parameter is not "const vout_display_cfg_t *". This could not work.

modules/video_output/ios2.m

@@ -264,7 +264,6 @@ static int Control(vout_display_t *vd, int query, va_list ap)
             return VLC_EGENERIC;
 
         case VOUT_DISPLAY_CHANGE_FULLSCREEN:
-        case VOUT_DISPLAY_CHANGE_WINDOW_STATE:
         case VOUT_DISPLAY_CHANGE_DISPLAY_FILLED:
         case VOUT_DISPLAY_CHANGE_ZOOM:
         case VOUT_DISPLAY_CHANGE_SOURCE_ASPECT: