freedreno/a6xx: fixup draw state earlier

`fixup_draw_state()` was updating `ctx->dirty` after it had already been
copied into the emit struct, which had the result that we were not re-
emitting the rast state when primitive_restart changes.

Fixes: 4d8f42c8512 ("freedreno/a6xx: separate rast stateobj for prim restart")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3067
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6117>