Vulkan: Fix PBO read pixels with unaligned output pitch Vulkan takes the output pitch in texels instead of bytes in VkBufferImageCopy::bufferRowLength. This means that it's impossible to use vkCmdCopyImageToBuffer when the pitch is not a multiple of texel size. This change makes sure the fallback path is taken. Bug: angleproject:5667 Change-Id: I3f2ef312bb8288de8ca3c6730d85a3c14858812e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2717006 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>