Fix apple-perf export tests for 8da4w_out_8da8w (#13848)

Author: jackzhxng

.github/workflows/apple-perf.yml

@@ -230,7 +230,7 @@ jobs:
                 model.use_sdpa_with_kv_cache=true \
                 backend.xnnpack.enabled=true \
                 backend.xnnpack.extended_ops=true \
-                base.preq_mode="8da4w_output_8da8w" \
+                base.preq_mode="preq_8da4w_out_8da8w" \
                 base.preq_group_size=32 \
                 export.max_seq_length=2048 \
                 export.max_context_length=2048 \
@@ -256,7 +256,7 @@ jobs:
                 base.params="${DOWNLOADED_PATH}/params.json" \
                 quantization.use_qat=true \
                 base.use_lora=16 \
-                base.preq_mode="8da4w_output_8da8w" \
+                base.preq_mode="preq_8da4w_out_8da8w" \
                 base.preq_group_size=32 \
                 base.preq_embedding_quantize=\'8,0\' \
                 model.use_sdpa_with_kv_cache=true \