uxtheme: fix nasty regression with painting of themed progressbar

[Alex Villací­s Lasso]

I was about to start adding more richedit tests, when I stumbled onto 
this when trying to install a program. The painting of the install 
progressbar causes UXTHEME_SizedBlt to be called with source width equal 
to zero, which causes a division by zero exception. The previous code 
handled it by not iterating and returning TRUE, so this fix does the 
same after a check.

Changelog:
* Check for zero source dimensions, and if so, return TRUE without doing 
anything.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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