fix(mpris): skip caching base64 cover arts

[navidmafi]

This fixes thousands of lines of base64 output splattering all over your terminal.

[Aylur]

we should instead handle it and also write that to a file

[navidmafi]

I thought to myself that since the data is available at demand at no cost (unlike https) there would be no need for caching

Is my reasoning incorrect? I will try to adapt this to handle them

[Aylur]

Its not cached for the sake of being cached. It is cached so that it is written to a file which is easier to work with on the user's side through the cover_art prop.