OS: Remove native video API only implemented on iOS

See discussion in #43811, it was only implemented on iOS and even that
implementation was fairly limited. This would best be provided as plugins
for Android and iOS without cluttering the shared OS API.

platform/javascript/display_server_javascript.cpp

@@ -827,7 +827,6 @@ bool DisplayServerJavaScript::has_feature(Feature p_feature) const {
 		//case FEATURE_MOUSE_WARP:
 		//case FEATURE_NATIVE_DIALOG:
 		//case FEATURE_NATIVE_ICON:
-		//case FEATURE_NATIVE_VIDEO:
 		//case FEATURE_WINDOW_TRANSPARENCY:
 		//case FEATURE_KEEP_SCREEN_ON:
 		//case FEATURE_ORIENTATION: