Convert uses of DirAccess * to DirAccessRef to prevent memleaks

`DirAccess *` needs to be deleted manually, and this is often forgotten
especially when doing early returns with `ERR_FAIL_COND`.
`DirAccessRef` is deleted automatically when it goes out of scope.

Co-authored-by: bruvzg <7645683+bruvzg@users.noreply.github.com>

platform/javascript/api/javascript_tools_editor_plugin.cpp

@@ -124,7 +124,7 @@ void JavaScriptToolsEditorPlugin::_zip_file(String p_path, String p_base_path, z
 }
 
 void JavaScriptToolsEditorPlugin::_zip_recursive(String p_path, String p_base_path, zipFile p_zip) {
-	DirAccess *dir = DirAccess::open(p_path);
+	DirAccessRef dir = DirAccess::open(p_path);
 	if (!dir) {
 		WARN_PRINT("Unable to open directory for zipping: " + p_path);
 		return;