Fix CopyTexture3D test to remove Nvidia workaround
Fix CopyTexture3D test to remove Nvidia workaround

Bug: angleproject:4748
Change-Id: I8e66fda3c9fd234451ad765c8777cd75b4fc44fc
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2279136
Reviewed-by: Shahbaz Youssefi <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>
Commit-Queue: Shahbaz Youssefi <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>

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