Fix broken upgrade caused by undefined method call

Signed-off-by: Julius Härtl <jus@bitgrid.net>

lib/private/App/AppStore/Fetcher/AppFetcher.php

@@ -151,6 +151,5 @@ class AppFetcher extends Fetcher {
 		parent::setVersion($version);
 		$this->fileName = $fileName;
 		$this->ignoreMaxVersion = $ignoreMaxVersion;
-		$this->setEndpoint();
 	}
 }