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

[Stefan Dösinger]

> Am 09.06.2016 um 16:24 schrieb Henri Verbeet <hverbeet at gmail.com>:
> I was under the impression the original p8_primary_test() failed like
> this from time to time as well, although it seems to fail more
> reliably now.
Afaics it used to crash. The "last test seen before the exception" prior to removing the old test doesn't quite make sense though.
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