Remove duplicate orientation settings in the iOS export preset

[Calinou]

3.x version of #48939 (backwards compatible).

The screen orientation is now sourced from the Project Settings like it is done for Android already.

See #45422.

[akien-mga]

./platform/android/export/gradle_export_util.h: In function 'String _get_activity_tag(const Ref<EditorExportPreset>&)':
./platform/android/export/gradle_export_util.h:253:54: error: '_get_screen_orientation' was not declared in this scope
  253 |  String orientation = _get_android_orientation_label(_get_screen_orientation());
      |                                                      ^~~~~~~~~~~~~~~~~~~~~~~
scons: *** [platform/android/export/export.x11.opt.tools.64.o] Error 1
platform/iphone/export/export.cpp: In member function 'void EditorExportPlatformIOS::_fix_config_file(const Ref<EditorExportPreset>&, Vector<unsigned char>&, const EditorExportPlatformIOS::IOSConfigData&, bool)':
platform/iphone/export/export.cpp:496:27: error: 'class OS' has no member named 'get_orientation_from_string'; did you mean 'get_screen_orientation_from_string'?
  496 |      OS::get_singleton()->get_orientation_from_string(GLOBAL_GET("display/window/handheld/orientation"));
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                           get_screen_orientation_from_string

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.3.3.