Vulkan: Fix image copy flipping The draw framebuffer was consulted for flipping instead of the read framebuffer. Revealed a bug with copy-with-transfer not taking source render target's level/layer into account. This test was failing on Linux/Intel because there the framebuffer is not flipped, so the transfer path was taken. Bug: angleproject:2954 Bug: angleproject:3723 Change-Id: If95bf97b8e0536302ed39999be47bf904283c9e4 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1718784 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>