Vulkan: Fix resolve-with-subpass with non-zero read attachment The draw framebuffer's color index was used to get the read buffer of the source framebuffer. Bug: b/159903491 Change-Id: I7a1626e6732367c14d46f1e1be4057998fdbf011 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2390440 Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>