Fix recognition of resource extensions.

Also removes a related debug print.

core/class_db.cpp

@@ -1196,7 +1196,7 @@ void ClassDB::get_extensions_for_type(const StringName &p_class, List<String> *p
 
 	while ((K = resource_base_extensions.next(K))) {
 		StringName cmp = resource_base_extensions[*K];
-		if (is_parent_class(p_class, cmp))
+		if (is_parent_class(p_class, cmp) || is_parent_class(cmp, p_class))
 			p_extensions->push_back(*K);
 	}
 }

editor/property_editor.cpp

@@ -116,7 +116,6 @@ void CustomPropertyEditor::_menu_option(int p_which) {
 
 					Set<String> valid_extensions;
 					for (List<String>::Element *E = extensions.front(); E; E = E->next()) {
-						print_line("found: " + E->get());
 						valid_extensions.insert(E->get());
 					}