Fix perf-changelog config key to dsv4-fp4-gb300-dynamo-sglang-mtp

Author: yhyang201

perf-changelog.yaml

@@ -2669,7 +2669,7 @@
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1415
 
 - config-keys:
-    - dpskv4-gb300-sglang
+    - dsv4-fp4-gb300-dynamo-sglang-mtp
   description:
     - "Update SGLang image to v0.5.12 and remove obsolete env vars for MTP configs"
   pr-link: https://github.com/SemiAnalysisAI/InferenceX/pull/1478