Save ProjectSettings on editor restart

(cherry picked from commit 59e1c007a70d8df2c686f8ba448a3891979b35fd)

editor/project_settings_editor.cpp

@@ -1704,6 +1704,7 @@ TabContainer *ProjectSettingsEditor::get_tabs() {
 }
 
 void ProjectSettingsEditor::_editor_restart() {
+	ProjectSettings::get_singleton()->save();
 	EditorNode::get_singleton()->save_all_scenes();
 	EditorNode::get_singleton()->restart_editor();
 }