Update subscription uri

[forslund]

This fixes an issue loading new tracks probably caused by an update on spotify's side. The fix was suggested by @worleydl, all glory to them for figuring it out.

Resolves #288

[sashahilton00]

@kingosticks once you've tested and confirmed working, we'll merge this.

[kingosticks]

Yep. Works perfectly again for me too. Thanks @forslund and @worleydl.

[IsaacWoods]

Similar URIs appear elsewhere in the codebase (here, here and here). Has anyone confirmed whether these still work?

[aksel]

Similarly, but not metadata, here.

[sashahilton00]

Hmmm, we should probably update the url at #217 in spirc.rs, as mentioned above, as that's essentially the same problematic endpoint. EDIT: Just saw that the file @aksel is the target of the PR.

From what I can surmise though, metadata, users, etc. are all seperate services in Spotify's backend, and thus the necessary update to the URI of the users endpoint doesn't necessarily coincide with a change in the metadata endpoint. I suggest we leave the metadata uri's the same until a similar problem is encountered.

[forslund]

The L217 in spircs.rs is what this PR addresses, or am I missunderstanding something?

[sashahilton00]

No you missed nothing, I did. Going to merge this.

[aksel]

You are right, and I am blind :~)