uxtheme: skip creation of temporary bitmap when painting a single tile

[Alex Villací­s Lasso]

On quite a few cases, the source and destination widths are such that 
only a single tile, or a portion of a single tile, will fit in the 
described area. In these cases, we can do away with the temporary bitmap 
and use the source HDC directly. Please apply after the patch that fixes 
the division-by-zero regression.

Changelog:
* Check whether a single tile is being painted, and if so, use source 
HDC directly without creating a temporary HDC/bitmap.

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

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