player: Handle Phonon-generated pause actions.
It seems we can get into a Phonon pause state without going through JuK's own pause-specific code path. With this patch I can watch KMix receive pause events on MPRIS2 with phonon-vlc. Based on a patch by James Smith that has been languishing in a review request. My apologies for the delay! Some whitespace fixes as well. If there's an open Juk bug for this please let me know and I'll review it. I'm closing/CC-ing the one bug I see that might be relevant, which couldn't be reproduced earlier (and shouldn't be reproduceable after this change). REVIEW:118754 BUG:290689
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