Fix Vulkan Copy as draw shader

Bug: skia:7663
Change-Id: I745900ccc56c697e4abb982e921d99bc28502b33
Reviewed-on: https://skia-review.googlesource.com/114687
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
(cherry picked from commit e464160f6969d28d0e8c76c493f325e3a716c4d2)
Reviewed-on: https://skia-review.googlesource.com/114801
Reviewed-by: Hal Canary <halcanary@google.com>
2 files changed