Let DI handle the background job

Fixes #7548

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

lib/private/Server.php

@@ -1093,16 +1093,6 @@ public function __construct($webRoot, \OC\Config $config) {
 			return new CloudIdManager();
 		});
 
-		/* To trick DI since we don't extend the DIContainer here */
-		$this->registerService(CleanPreviewsBackgroundJob::class, function (Server $c) {
-			return new CleanPreviewsBackgroundJob(
-				$c->getRootFolder(),
-				$c->getLogger(),
-				$c->getJobList(),
-				new TimeFactory()
-			);
-		});
-
 		$this->registerAlias(\OCP\AppFramework\Utility\IControllerMethodReflector::class, \OC\AppFramework\Utility\ControllerMethodReflector::class);
 		$this->registerAlias('ControllerMethodReflector', \OCP\AppFramework\Utility\IControllerMethodReflector::class);