ddraw: ddrawmodes test failures (all platforms)

[Reece Dunn]

Hi,

Looking at the ddrawmode test failures, they are because the test is
checking that if the DDSD_REFRESHRATE flag is set, then dwRefreshRate
is not 0. However, on many of the test platforms at
http://test.winehq.org/data/200801161000, they are reporting a refresh
rate of 0.

Are these bogus - due to them running on VM - or is this a valid case?
I don't currently have the ability to build those tests locally, so I
cannot verify those failures.

- Reece