Vulkan: Enable the doubleDepthBiasConstantFactor feature on NV Experimentally found to make behavior more consistent with other platforms. Discovered through a Dawn issue [1]. [1]: https://bugs.chromium.org/p/dawn/issues/detail?id=2076 Bug: b/249380591 Change-Id: I27777397d717da0d400b9e15508b17b5329e1e8e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5296380 Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>