community/navidrome: upgrade to 0.50.0
Sorted the config file to make it easier for me to compare it with the documentation.
v0.50.0 introduces a config option to specify the cache. The default is still the same as before: /var/lib/navidrome/cache. I've added a commented line in the /etc/conf.d/navidrome file, not sure if I should be enabling it by default since previous files would still exist in /var/lib/navidrome/cache