tu: Fix descriptor update templates with input attachments

Found via
dEQP-VK.binding_model.descriptorset_random.sets4.noarray.ubolimitlow.sbolimitlow.sampledimglow.outimgonly.noiub.nouab.frag.ialimitlow.0

Fixes: 159a1300ceb ("turnip: input attachment descriptor set rework")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6087>
1 file changed