[mythtv] Can't SEEKFFWD or SEEKRWND in LiveTV r7972

[Bryan Mayland]

There's a problem with seeking forward or back while watching LiveTV 
under r7972 (current as of right now).  Either of these actions results 
in a 0 second seek.  Jump forward and back work fine.

The problem is that the values for rewtime and fftime are set to 0 in 
the libmythtv/tv_play.cpp TV::TV() and are never changed unless doing a 
PlayFromRecorder() is used instead of LiveTV().  The PlayGroup settings 
are just not loaded if watching LiveTV.

I can submit a ticket to trac, but thought this might be related to #669 
and wanted to confirm / deny before I added to that report.
http://cvs.mythtv.org/trac/ticket/669