d3d11window: Remove hack related to color space selection
Use input GstVideoColorPrimaries without any special case handling otherwise rendered image color would be very wrong.
The hack was added to work around an issue that some Intel driver couldn't handle wide color gamut image without HDR10 metadata, specifically PQ image. But device capability can be checked via a method added in gst-plugins-bad!1723 (merged) so there's no issue now.