Backgroundjobs: Fix wrong var names

lib/backgroundjob/queuedtask.php

@@ -81,7 +81,7 @@ class OC_BackgroundJob_QueuedTask{
 	 * @param $parameters all useful data as text
 	 * @return id of task
 	 */
-	public static function add( $task, $klass, $method, $parameters ){
+	public static function add( $app, $klass, $method, $parameters ){
 		$stmt = OC_DB::prepare( 'INSERT INTO *PREFIX*queuedtasks (app, klass, method, parameters) VALUES(?,?,?,?)' );
 		$result = $stmt->execute(array($app, $klass, $method, $parameters ));
 

lib/public/backgroundjob.php

@@ -100,8 +100,8 @@ class BackgroundJob {
 	 * @param $parameters all useful data as text
 	 * @return id of task
 	 */
-	public static function addQueuedTask( $task, $klass, $method, $parameters ){
-		return \OC_BackgroundJob_QueuedTask::add( $task, $klass, $method, $parameters );
+	public static function addQueuedTask( $app, $klass, $method, $parameters ){
+		return \OC_BackgroundJob_QueuedTask::add( $app, $klass, $method, $parameters );
 	}
 
 	/**