Vulkan: Enable 16 additional tests for the scissor test This set of expectations modifications effectively enables exactly these tests: dEQP-GLES2.functional.fragment_ops.scissor.* -> 16/16 tests passed. Bug:angleproject:2338 Change-Id: Icb971e0e7b253e7df390de1196cc4bc4401f9631 Reviewed-on: https://chromium-review.googlesource.com/957269 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>