model : set res->t_embd in SmallThinker models (ggml-org#16782)

Author: CISC

src/llama-model.cpp

@@ -19678,6 +19678,7 @@ struct llm_build_smallthinker : public llm_graph_context{
 
         cur = build_norm(cur, model.output_norm, NULL, LLM_NORM_RMS, -1);
         cb(cur, "result_norm", -1);
+        res->t_embd = cur;
 
         // lm_head
         cur = build_lora_mm(model.output, cur);