Fix crash when selecting favorate directory on EditorFileDialog

The problem was that favorite tool button kept to change pressed
and unpressed state with toggled event.
This is a quick fix for crash.
EditorFileDialog might need to be refactor later.

editor/editor_file_dialog.h

@@ -151,6 +151,7 @@ private:
 
 	void _update_favorites();
 	void _favorite_toggled(bool p_toggle);
+	void _favorite_pressed();
 	void _favorite_selected(int p_idx);
 	void _favorite_move_up();
 	void _favorite_move_down();