Adds ability to configure sort order for DLNA videos

[cj12312021]

This pull request adds the ability to configure the default sort order videos I'm DLNA.

Fixes #2166.

[cj12312021]

Once saved filters are integrated into DLNA, I imagine the breakdown would look like this:

Scenes
 |- All
 |- Saved Filter 1
 |- Saved Filter 2
Movies
 |- All
     |- Movie 1
     |- Movie 2
 |- Saved Filter 1
     ....
 |- Saved Filter 2
     ....
Performers
 |- All
     |- Performer 1
     |- Performer 2
 |- Saved Filter 1
      ....
 |- Saved Filter 2
      ....
Studios
 |- All
     |- Studio 1
     |- Studio 2
 |- Saved Filter 1
      ....
 |- Saved Filter 2
      ....
Tags
 |- All
     |- Tag 1
     |- Tag 2
 |- Saved Filter 1
      ....
 |- Saved Filter 2
      ....

When this work is done, the save filter sort order would clearly override the default sort order for videos under the scenes saved filter folders. The default sort order would come into play for videos under folders such as movies, performers, studios, and tags since the saved filters would only apply to the order of the movies, performers, studios, and tags displayed and not the videos under each of those folders.

[kermieisinthehouse]

Code reviewed but not tested.