comctl32: proper fix redrawing the trackbar background with themes enabled.

[Reece Dunn]

This patch provides the correct fix for a bug that I provided a patch
for after wineconf.

The DrawThemeBackground that I added was drawing the bar component in
the middle as the background of the entire control. This was wrong,
even though it fixed the black background/repainting issues.

The actual fix is to not supply the DrawThemeParentBackground call
with a clip rect, as the clip rect is incorrect for this usage.

- Reece
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