[music] SortByTrackNumber as default sort for "songs"

[DaveTBlake]

The most natural default sort order for viewing songs is track number. But on a clean installation "songs" nodes are currently sorted by file name, and this catches a number of users out. Many get very confused because the name my include a track number, so the odd sorting only shows up when they come to a multiple disc album e.g. have two track 01s next to each other.

A trivial change @jjd-uk requested, and makes sense to me.

[razzeee]

Just one question, the label for each row is still how you want it in this case?

[jjd-uk]

Seems to operate as I'd expect sorting by track where there is one then falling back to name sorting where there isn't.

So +1 from me.

[DaveTBlake]

Just one question, the label for each row is still how you want it in this case?

Yes @razzeee I think so

[razzeee]

jenkins build and merge