FileSystem: Force update when we delete a folder from the editor and searching changes only if we change the directory successfully in the scan_fs_changes

(cherry picked from commit dc76938679)

editor/editor_file_system.h

@@ -101,6 +101,8 @@ public:
 	int find_file_index(const String &p_file) const;
 	int find_dir_index(const String &p_dir) const;
 
+	void force_update();
+
 	EditorFileSystemDirectory();
 	~EditorFileSystemDirectory();
 };