Fix MPRIS supportedUriSchemes typo

[Notexe]

KDE Media Player's applet now picks up spotify-qt with this fix.

Current track info shows, next/previous/pause buttons work. Seems like there is an issue with trying to resume playback though but that is unrelated to this commit.

[kraxarn]

Thank you very much for this! Maybe this issue can finally be resolved soon 😄

I'm also able to reproduce the issue related to resuming playback. Seems like spotify-qt reports the correct playback status, but it's still not detected properly. Skipping also doesn't seem to work. I'll look into it.

[Notexe]

No problem. I was trying to figure out why KDE just wasn't picking it up at all so I started looking at the MPRIS specs and finally found the issue which happened to be that typo.

Skipping seems to work for me so that's very strange that it's not working for you. Hopefully it's something easy to fix at least.

Anyways thank you making this program 😄. It's much nicer to use compared to the official client which can't even be minimised to the tray which was the main reason I tried this out instead.

[kraxarn]

Read a bit more about the specification, and realized you have to emit a PropertiesChanged event when the status changes for it to recognize it properly. Simply added a check for it (8bba9b7) and play/pause from mpris seems to work much better now 😄