fix optimize_mode issue (#3731)

Co-authored-by: Lijiao <Lijiaoa@outlook.com>

ts/webui/src/static/model/experiment.ts

@@ -131,8 +131,8 @@ class Experiment {
 
     get optimizeMode(): string {
         for (const algo of [this.config.tuner, this.config.advisor, this.config.assessor]) {
-            if (algo && algo.classArgs && algo.classArgs['optimizeMode']) {
-                return algo.classArgs['optimizeMode'];
+            if (algo && algo.classArgs && algo.classArgs['optimize_mode']) {
+                return algo.classArgs['optimize_mode'];
             }
         }
         return 'unknown';