youtube: Fix detection of playing status (#481)
youtube: Fix detection of playing status (#481)

The selector for YouTube playState (play button) used to be
".ytp-play-button[aria-label='Pause']" but I recently found that it was
changed to ".ytp-play-button[aria-label='Pause (k)']" in the source of
the YouTube page, breaking the detection of the YouTube playing state in
StreamKeys. Fix that by checking if 'aria-label' begins with 'Pause'
instead of using an exact match.

Signed-off-by: Alex Tsitsimpis <d673598232c1e164b1f12daba87f026c8bf40526@gmail.com>
alexesprit/streamkeys,nemchik/streamkeys,nemchik/streamkeys,alexesprit/streamkeys,berrberr/streamkeys,nemchik/streamkeys,berrberr/streamkeys,berrberr/streamkeys