freedreno/ir3: fix flat shading again

These days ctx->inputs is the split scalar input components and ir->inputs is the full vecN. This got fixed in the load_input case, but the load_interpolated_input case was missed.

Fixes: bdf6b701 ("freedreno/ir3: re-work shader inputs/outputs") Signed-off-by: Rob Clark robdclark@chromium.org