### 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
for (int i = 0; i < p_dir->get_subdir_count(); i++) {
		_export_find_resources(p_dir->get_subdir(i), p_paths);
	}
	for (int i = 0; i < p_dir->get_file_count(); i++) {
		if (p_dir->get_file_type(i) == "TextFile") {
			continue;
		}
		p_paths.insert(p_dir->get_file_path(i));
	}
}
void EditorExportPlatform::_export_find_customized_resources(const Ref<EditorExportPreset> &p_preset, EditorFileSystemDirectory *p_dir, EditorExportPreset::FileExportMode p_mode, HashSet<String> &p_paths) {
	for (int i = 0; i < p_dir->get_subdir_count(); i++) {
		EditorFileSystemDirectory *subdir = p_dir->get_subdir(i);
		_export_find_customized_resources(p_preset, subdir, p_preset->get_file_export_mode(subdir->get_path(), p_mode), p_paths);
	}
	for (int i = 0; i < p_dir->get_file_count(); i++) {
		if (p_dir->get_file_type(i) == "TextFile") {
			continue;
		}
		String path = p_dir->get_file_path(i);
		EditorExportPreset::FileExportMode file_mode = p_preset->get_file_export_mode(path, p_mode);
		if (file_mode != EditorExportPreset::MODE_FILE_REMOVE) {
			p_paths.insert(path);
		}
	}
}
void EditorExportPlatform::_export_find_dependencies(const String &p_path, HashSet<String> &p_paths) {