Context menu does not properly update ratings [#15204]

[TIV73]

Hi,
when rating a track in the library via right-click menu, the rating is only valid for the current MM session, but is not written to the DB or synchronized to the file properties of the track.

Steps to reproduce:
- Choose any track in the local library and verify that its file is not write protected.
- Right click the track.
- From the context menu, select the 'My Rating' option and change the track's rating.
- Restart MediaMonkey.

The rating of the track will have its initial value, both in MediaMonkey and its file properties.

[PetrCBR]

Thanks. Will check. Tracked as 15204.