restore function was lost in merge

src-ui/src/app/components/document-list/document-list.component.ts

@@ -35,6 +35,10 @@ export class DocumentListComponent implements OnInit {
 
   filterRulesModified: boolean = false
 
+  get isFiltered() {
+    return this.list.filterRules?.length > 0
+  }
+
   getTitle() {
     return this.list.savedViewTitle || $localize`Documents`
   }