squash! server : use common_token_to_piece instead of common_detokenize

Use common_token_to_piece for post_sampling_probs as well.

Author: danbev

examples/server/server.cpp

@@ -2275,7 +2275,7 @@ struct server_context {
             for (size_t i = 0; i < std::min(max_probs, n_probs); i++) {
                 result.probs.push_back({
                     cur_p->data[i].id,
-                    common_detokenize(ctx, {cur_p->data[i].id}, special),
+                    common_token_to_piece(ctx, cur_p->data[i].id, special),
                     cur_p->data[i].p
                 });
             }