Fix Missing Icon and Add Category

[guilermt]

When playing music, the small icon of the YouTube Music app itself is missing.

Add a new category to be more organized, for example:

in the "playing" category add an application such as "minecraft" and automatically apply the playing activity

in the "watching" category add an application such as "neflix" and automatically apply the watching activity

in the "listening" category add an application such as "youtube music" and automatically apply the listening activity

[koimoee]

disable playback state at media rpc options, and tbh for category things is complicated for that..