QuickOpen: Disable loading resources for now, too slow

As expected while reviewing godotengine#62417 this is indeed not practical
without a better system to retrieve this information.

Fixes godotengine#66179.

editor/editor_quick_open.h

@@ -43,7 +43,7 @@ class EditorQuickOpen : public ConfirmationDialog {
 	Tree *search_options = nullptr;
 	StringName base_type;
 	bool allow_multi_select = false;
-	bool _load_resources = true;
+	bool _load_resources = false; // Prohibitively slow for now.
 
 	Vector<String> files;
 	OAHashMap<String, Ref<Texture2D>> icons;