Refine suppression for GLSLTest.SwizzledChainedAssignIncrement. On NVIDIA, skip only on OpenGL and GLES, not Vulkan. Bug: angleproject:7029 Change-Id: I2ec2732a94d3952a147df8616fd248876f12172c Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3469723 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>