Vulkan: Fix clear of non-zero-base-level images The staged resource updates adjusted their level to take base level into account, but clear updates used a cached unadjusted value. Bug: angleproject:3148 Change-Id: I9a49d5341083b2f870baa1ee6053e54baef35086 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2230786 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>