Fix issues with PHP7

[juliusknorr]

{"reqId":"g+R1mKQTrKxU08Sq9BBi","remoteAddr":"172.17.0.1","app":"PHP","message":"TypeError: Argument 2 passed to OCA\\AppOrder\\AppInfo\\Application::__construct() must be an instance of OCA\\AppOrder\\AppInfo\\NavigationManager, none given, called in \/usr\/share\/webapps\/owncloud\/apps\/apporder\/appinfo\/app.php on line 5 at \/usr\/share\/webapps\/owncloud\/apps\/apporder\/appinfo\/application.php#10","level":3,"time":"2016-05-18T21:49:32+00:00","method":"GET","url":"\/owncloud\/index.php","user":"admin"}