DirectShow: Emit media status before error

Media status should be emitted before any error.
Since error can cause changing the media and changing to new media
status.

Fixes
BFAIL  : tst_QMediaPlayerBackend::playlistObject() Compared values are not the same
   Actual   (mediaStatusSpy.count()): 4
   Expected (6)                     : 6

Task-number: QTBUG-46368
Change-Id: I8eb82e7a551d78abd143baa594cfda9bacd7e544
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>