tu: Remove useless prim_order state merging

We already merged it below, when the library has both fragment output
interface and fragment shader state (which is when we'd compute it
anyway). Setting it twice is probably harmless but also confusing and
useless.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33902>
diff --git a/src/freedreno/vulkan/tu_pipeline.cc b/src/freedreno/vulkan/tu_pipeline.cc
index 488f7af..269b37e 100644
--- a/src/freedreno/vulkan/tu_pipeline.cc
+++ b/src/freedreno/vulkan/tu_pipeline.cc
@@ -2099,7 +2099,6 @@
          pipeline->output = library->base.output;
          pipeline->lrz_blend.reads_dest |= library->base.lrz_blend.reads_dest;
          pipeline->lrz_blend.valid |= library->base.lrz_blend.valid;
-         pipeline->prim_order = library->base.prim_order;
       }
 
       if ((library->state &