ddraw/tests: Use wine_dbgstr_rect() in the ddraw7 tests.

Wed Jun 8 16:48:50 CDT 2016

> === w864 (32 bit ddraw7) ===
> ddraw7.c:7911: Test failed: Got unexpected P8 color key blit result.
Fwiw, this is my recently added test. I'll look at it on the weekend.

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