vulkan: return OUT_OF_DATE from GetSwapchainStatus if not current

We don't yet have good ways to detect other ways in which the swapchain
may have gone bad, but it's easy to detect the case where the swapchain
is not current for the surface it targets.

Test: build
Change-Id: Id882a4a699d65f323e8a5e181f0e25e903039f21