lavapipe: use slow clear path if conditional rendering.
the ->clear path checks render condition which isn't necessary.
Fixes dEQP-VK.conditional_rendering.draw.condition_host_memory_expect_noop_rp_clear.draw*
the ->clear path checks render condition which isn't necessary.
Fixes dEQP-VK.conditional_rendering.draw.condition_host_memory_expect_noop_rp_clear.draw*