Vulkan: Fix glCopyTexSubImage3D() Update glCopyTexSubImage3D() to account for the requirements necessary for VK_IMAGE_TYPE_3D. Bug: angleproject:3765 Test: KHR-GLES2.texture_3d.copy_sub_image.rgba8 Test: angle_end2end_tests CopyTexImageTestES3 Change-Id: Ife3d768323d0cfe2a53e5ae4c47a0747d65981bc Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1730637 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Tim Van Patten <timvp@google.com>