[mythtv] Dark Picture/Image and IRQ Lockup bug with fix

[Torbjörn Jansson]

> Problem:  Dark image/picture occurs at random times.  Most often
> after changing channels. 
> 
[cut]
> Fix:  Move the statements that set the brightness, contrast, hue and
> color/saturation to after the luma decimation filter.  There
> are 4 lines,
> starting at 1056.  Move them to 1068.
> 

Intresting, i'm going to test this and see if it helps with the black
picture problem.