Remove a work around that causes a crash in Unravel Two.

There is a callback in Unravel Two that appears to add a reference to a
IMediaSample, which this workaround treats as a leak and releases. However, the
application also later releases the reference itself, causing a use-after-free.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51616Signed-off-by: Brendan McGrath <brendan@redmandi.com>
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>