fix(getPlaylist): populate ArtistID and AlbumID

[richardsamuels]

The OpenSubsonic getPlaylist spec doc lists artistId and albumId as fields for playlist entries, which are currently not being populated.

This PR populates those fields.

[richardsamuels]

Tests fixed.

• The changes to .golangci.yml are to fix this error that popped up. It appears to be caused by an update to your linter action.
• The testdata files were not formatted in a readable way after using GONIC_REGEN, so I ran them through jq. This did not match your previous formatting perfectly. Let me know if you have a preferred linter for those files and I can fix them.

[sentriz]

thanks @richardsamuels would you mind rebasing? i also usually format with prettier --parser json --write server/ctrlsubsonic/testdata/*