freedreno: Use correct key for binning pass shader
We updated the key correctly for whether we wanted to use a safe_constlen binning pass variant, but then passed the wrong key to ir3_shader_variant().
Fixes: 1dd24bf2 ("freedreno: Share constlen between different stages properly") Signed-off-by: Rob Clark robdclark@chromium.org Part-of: !12314 (merged) (cherry picked from commit a79ac1be)