trace: Dump pipe_sampler_state::seamless_cube_map.

Trivial.

src/gallium/drivers/trace/tr_dump_state.c

@@ -470,6 +470,7 @@ void trace_dump_sampler_state(const struct pipe_sampler_state *state)
    trace_dump_member(uint, state, compare_func);
    trace_dump_member(bool, state, normalized_coords);
    trace_dump_member(uint, state, max_anisotropy);
+   trace_dump_member(bool, state, seamless_cube_map);
    trace_dump_member(float, state, lod_bias);
    trace_dump_member(float, state, min_lod);
    trace_dump_member(float, state, max_lod);