Update synthesize_e2e.sh

examples/aishell3/vits/local/synthesize_e2e.sh

@@ -13,6 +13,7 @@ if [ ${stage} -le 0 ] && [ ${stop_stage} -ge 0 ]; then
     FLAGS_allocator_strategy=naive_best_fit \
     FLAGS_fraction_of_gpu_memory_to_use=0.01 \
     python3 ${BIN_DIR}/synthesize_e2e.py \
+        --am=vits_aishell3 \
         --config=${config_path} \
         --ckpt=${train_output_path}/checkpoints/${ckpt_name} \
         --phones_dict=dump/phone_id_map.txt \