Fix warnings

src/common/settings.php

@@ -62,7 +62,7 @@ class Settings {
 	/**
 	 * Output the settings on destruct
 	 */
-	protected function __destruct()
+	public function __destruct()
 	{
 		file_put_contents(BASE_DIR . '/settings.json', json_encode($this->current));
 	}

src/windows/add_db.php

@@ -190,10 +190,9 @@ class Add_DB extends GtkWindow {
 	/**
 	 * Set defaults for new database type
 	 * 
-	 * @param  GtkComboBox $combo 
 	 * @return void
 	 */
-	public function change_db($combo)
+	public function change_db()
 	{
 		$new_db = $this->dbtype->get_active_text();