Vulkan: Don't invalidate XFB buffers on FBO switch.
Vulkan: Don't invalidate XFB buffers on FBO switch.

This shouldn't need to change when the FBO changes.

Bug: angleproject:4622
Change-Id: I4b06a0f02e8dd16d50aaf5ac5fe4bcb81fc76c8c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2204597
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Charlie Lao <2661ca4ca24c371418789adbc76dfb4875087223@google.com>
Reviewed-by: Tim Van Patten <c7814369a8d3d5671c484acc7b3215f1bf4221be@google.com>

ppy/angle,ppy/angle,ppy/angle,ppy/angle