Vulkan:Enable UpdateBufferInUse test on AMD

Re-tested this and it's now passing so turning it on.

Bug: angleproject:3255
Change-Id: Iccf63cfaa4386dfda5628e189362631e655953f5
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1876081
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Tobin Ehlis <tobine@google.com>

src/tests/gl_tests/StateChangeTest.cpp

@@ -1891,8 +1891,6 @@ TEST_P(SimpleStateChangeTest, RedefineBufferInUse)
 // Tests updating a buffer's contents while in use, without redefining it.
 TEST_P(SimpleStateChangeTest, UpdateBufferInUse)
 {
-    // tobine: Started failing w/ custom cmd buffers. http://anglebug.com/3255
-    ANGLE_SKIP_TEST_IF(IsAMD() && IsWindows() && IsVulkan());
     std::vector<GLColor> redColorData(6, GLColor::red);
 
     GLBuffer buffer;