Vulkan: Enable 3.0 as default context version Now that 3.0 support is passing dEQP, always return that as the context version to use (unless app asks for 1.0). Test: angle_end2end --gtest_filter=EGLBackwardsCompatibleContextTest.BackwardsCompatibleEnabledES3/* Bug: angleproject:3750 Change-Id: I0402ac015acfc22e84a985fe75346999bcc47188 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1906202 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Tobin Ehlis <tobine@google.com> Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com>