### Godot version

4.x

### System information

Windows 10

### Issue description

The `Search Result` panel is not correctly updated when changing the theme.

https://user-images.githubusercontent.com/66004280/208964493-d0423b78-3418-44c9-95ed-822fd34c4720.mp4



### Steps to reproduce

1. Search something
2. Change the theme

### Minimal reproduction project

--
String folder_name = folders_to_scan[folders_to_scan.size() - 1];
			pop_back(folders_to_scan);
			_current_dir = _current_dir.path_join(folder_name);
			PackedStringArray sub_dirs;
			_scan_dir("res://" + _current_dir, sub_dirs);
			_folders_stack.push_back(sub_dirs);
		} else {
			
			pop_back(_folders_stack);
			_current_dir = _current_dir.get_base_dir();
			if (_folders_stack.size() == 0) {
				
				_initial_files_count = _files_to_scan.size();
			}
		}
	} else if (_files_to_scan.size() != 0) {
		
		String fpath = _files_to_scan[_files_to_scan.size() - 1];
		pop_back(_files_to_scan);
		_scan_file(fpath);
	} else {
		print_verbose("Search complete");
		set_process(false);
		_current_dir = "";
		_searching = false;
		emit_signal(SNAME(SIGNAL_FINISHED));
	}
}
float FindInFiles::get_progress() const {