[mythtv] Preview image cleanup

[Otto Kolsi]

>> myth.find_orphans.pl is very handy and I'm running it weekly to spot out 
>> any left overs etc. However, it doesn't recognize the 'size' format of 
>> MythWeb's preview images. To correct this, I've added following two 
>> lines around line 147 in myth.find_orphans.pl:
> 
> Can you open a ticket with your patches (if you haven't already)

See #3641.

I've only observed the other issue related to nuv transcodings, don't 
have any fixes for that one. I'll probably create a ticket later about 
it so that it's not forgotten.
-- 
   Otto