Fix: Add video icon in knowledge base #10703 (#10832)

### What problem does this PR solve?

Fix: Add video icon in knowledge base

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/dataset/dataset/index.tsx

@@ -86,7 +86,7 @@ export default function Dataset() {
           leftPanel={
             <div className="items-start">
               <div className="pb-1">{t('knowledgeDetails.subbarFiles')}</div>
-              <div className="text-text-sub-title-invert text-sm">
+              <div className="text-text-secondary text-sm">
                 {t('knowledgeDetails.datasetDescription')}
               </div>
             </div>