perf: 优化JavascriptFilterModal取值判断

@@ -58,7 +58,7 @@
   const getValue = computed<string>({
     get() {
       const { scriptLang, jsScript = '', tbelScript = '' } = props.value || {};
-      return scriptLang === ScriptLanguageEnum.JavaScript ? jsScript : tbelScript;
+      return scriptLang === ScriptLanguageEnum.TBEL ? tbelScript : jsScript;
     },
     set(value) {
       const { jsScript, tbelScript } = props.value || {};