Merge pull request #558 from nextcloud/fix/noid/what-for-viewer

fix(UI): script to register at viewer has to require viewer

lib/Listener/LoadViewerListener.php

@@ -10,6 +10,6 @@
 
 class LoadViewerListener implements IEventListener {
 	public function handle(Event $event): void {
-		Util::addScript('officeonline', 'viewer');
+		Util::addScript('officeonline', 'viewer', 'viewer');
 	}
 }