Don't try to import unknown dependency from scan

Only import dependency we know how to import, since custom resource may have .gd in dependency list which doesn't have an importer

(cherry picked from commit 0463a445c4470509d581747bd272b0a76227c723)

editor/editor_file_system.cpp

@@ -549,7 +549,12 @@ bool EditorFileSystem::_update_scan_actions() {
 				if (_test_for_reimport(full_path, false)) {
 					//must reimport
 					reimports.push_back(full_path);
-					reimports.append_array(_get_dependencies(full_path));
+					Vector<String> dependencies = _get_dependencies(full_path);
+					for (int i = 0; i < dependencies.size(); i++) {
+						if (import_extensions.has(dependencies[i].get_extension())) {
+							reimports.push_back(dependencies[i]);
+						}
+					}
 				} else {
 					//must not reimport, all was good
 					//update modified times, to avoid reimport