d3d9/tests: Don't create a Null-shader in d3d9, it will crash.

[Henri Verbeet]

2008/12/23 Stefan Dösinger <stefan at codeweavers.com>:
> I never saw this crashing on any of my systems, so it is probably driver dependent. Which Windows driver are you using?
>
> If the test crashes on either ATI, Nvidia or Intel it is a good idea to remove it. I don't think we should remove it if it crashes on something like VMWare or other 'noname' cards.
>
The patch is already applied, but I think removing the test is the
right thing to do. I only added the test to test what error d3d9
returns when a NULL shader is passed. If it depends on the driver, I
doubt we care.