The last render-to-texture commit broke FL10_0 multisampling by
unconditionally asking for D3D11_STANDARD_MULTISAMPLE_PATTERN
quality setting.

Per the documentation on
https://docs.microsoft.com/en-us/windows/win32/api/d3d11/ne-d3d11-d3d11_standard_multisample_quality_levels
applications can only request the standard multisample pattern on
feature levels 10_1 and above.

For feature levels 10_0 and below, we'll stick with asking for a
quality level of 0 like the code previous did.

Bug: chromium:1036367
Change-Id: I0dd7704cf144ebce952e1f7d5e148d3382891aed
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2003238
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>