Stop file only if removed file is an audio file

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -1784,7 +1784,7 @@ public class FileDisplayActivity extends FileActivity
 
     private void tryStopPlaying(OCFile file) {
         // placeholder for stop-on-delete future code
-        if(mPlayerConnection != null) {
+        if (mPlayerConnection != null && MimeTypeUtil.isAudio(file) && mPlayerConnection.isPlaying()) {
             mPlayerConnection.stop(file);
         }
     }