Apply suggestions from code review

Co-authored-by: Claus Vium <cvium@users.noreply.github.com>

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -542,7 +542,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                             .Append(' ');
                     }
 
-                    arg.Append("-autorotate 0");
+                    arg.Append("-autorotate 0 ");
                 }
 
                 if (state.IsVideoRequest