fix: qwen30 config had typo in metric check (#1266)

Signed-off-by: Terry Kong <[email protected]>

Author: terrykong

tests/test_suites/llm/grpo-math-qwen3-30ba3b-megatron-tp4-32k.sh

@@ -35,5 +35,5 @@ uv run tests/json_dump_tb_logs.py $LOG_DIR --output_path $JSON_METRICS
 if [[ $(jq 'to_entries | .[] | select(.key == "train/loss") | .value | keys | map(tonumber) | max' $JSON_METRICS) -ge $MAX_STEPS ]]; then
     uv run tests/check_metrics.py $JSON_METRICS \
         'mean(data["train/token_mult_prob_error"]) < 1.1' \
-        'data["train/token_mult_prob_error"]["$MAX_STEPS"] < 1.1'
+        'data["train/token_mult_prob_error"]["3"] < 1.1'
 fi