If music is not defined in Map Info, should fall back to the default music
Older mods may not specify a music ID in Map Info. However,
patchmapinfo.ded in the games' definitions makes the assumption that only non-custom Map Infos get the default music.
A better way to set the default songs would be to have a Music definition matching each map ID, so that if the Map Info does not specify a song, it can always fall back to choosing a Music definition based on the map ID.
Music|Definitions: Fall back to default music
If a custom Map Info doesn’t specify any music, it should use the map’s default song.
Removed the default songs from the games’ patchmapinfo.ded, as that method of applying the default songs does not work with custom Map Infos that don’t set a music ID. Instead, there is now a Music definition matching each map ID.