player: Minor cleanups

Do not retrieve current_media needlessly again.

_lastfm.scrobble and arguments can be on one line.
3 jobs for wip/mschraal/lastfm-scrobble-prop in 21 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Check
passed #4515
pep8

00:05:28

passed #4514
pyflakes

00:05:20

 
  Build
passed #4516
build

00:10:57