### Godot version

any version after 74458b6

### System information

Linux x64, but likely irrelevant

### Issue description

OpenXR action maps are not properly exported in recent builds of Godot 4: the `.res` file is small and does no longer seem to contain anything of use. In-game, no actions are passed on to OpenXR (obviously).

I bisected the issue down to https://github.com/godotengine/godot/commit/74458b6e9bed0f28db3374c7406eacbcf4b09b9d, which was merged in #70377.

### Steps to reproduce

1. Delete any previous export files (`.godot/exported/*/*.pkg`)
2. Perform an export (I did one for Android, but it likely works with anything)
3. Observe OpenXR actions not working in the export (error spam 'sync_action_sets: Condition "active_sets.size() == 0"'), and the exported action map file being very small (`.godot/exported/*/*.pkg`, from a few tens of kilobytes down to 296 bytes)

### Minimal reproduction project

Any OpenXR project can be used, such as https://github.com/BastiaanOlij/godot4_openxr_demo
}
	
	String icon = GLOBAL_GET("application/config/icon");
	String splash = GLOBAL_GET("application/boot_splash/image");
	if (!icon.is_empty() && FileAccess::exists(icon)) {
		Vector<uint8_t> array = FileAccess::get_file_as_bytes(icon);
		err = p_func(p_udata, icon, array, idx, total, enc_in_filters, enc_ex_filters, key);
		if (err != OK) {
			return err;
		}
	}
	if (!splash.is_empty() && FileAccess::exists(splash) && icon != splash) {
		Vector<uint8_t> array = FileAccess::get_file_as_bytes(splash);
		err = p_func(p_udata, splash, array, idx, total, enc_in_filters, enc_ex_filters, key);
		if (err != OK) {
			return err;
		}
	}
	String resource_cache_file = ResourceUID::get_cache_file();
	if (FileAccess::exists(resource_cache_file)) {
		Vector<uint8_t> array = FileAccess::get_file_as_bytes(resource_cache_file);
		err = p_func(p_udata, resource_cache_file, array, idx, total, enc_in_filters, enc_ex_filters, key);
		if (err != OK) {
			return err;
		}
	}
	String extension_list_config_file = GDExtension::get_extension_list_config_file();
	if (FileAccess::exists(extension_list_config_file)) {
		Vector<uint8_t> array = FileAccess::get_file_as_bytes(extension_list_config_file);
		err = p_func(p_udata, extension_list_config_file, array, idx, total, enc_in_filters, enc_ex_filters, key);