[BUGFIX] #522 add media type for transcoded files
Corret file path

This file path doesn't exist,and causes : [error] 8767#0: *4811 open() "/var/www/ampache//modules/jquery-jplayer/jquery-jplayer.midnight.black.video.play.png" failed (2: No such file or directory)
Merge pull request #524 from mat-mo/develop

Corret file path
Fix code styles through php-cs-fixer
Merge pull request #523 from Razrael/feature/transcodedMediaStream

[BUGFIX] #522 add media type for transcoded files