[mob][photos] Fix face thumbnail not appearing when filter is applied

mobile/lib/ui/viewer/hierarchicial_search/applied_filters.dart

@@ -1,5 +1,4 @@
 import "package:flutter/material.dart";
-import "package:photos/models/file/file.dart";
 import "package:photos/models/search/hierarchical/face_filter.dart";
 import "package:photos/models/search/hierarchical/hierarchical_search_filter.dart";
 import "package:photos/ui/viewer/gallery/state/inherited_search_filter_data.dart";
@@ -55,7 +54,7 @@ class _AppliedFiltersState extends State<AppliedFilters> {
               ? FaceFilterChip(
                   personId: filter.personId,
                   clusterId: filter.clusterId,
-                  faceThumbnailFile: EnteFile(),
+                  faceThumbnailFile: filter.faceFile,
                   name: filter.name(),
                   onTap: () {
                     _searchFilterDataProvider.removeAppliedFilters([filter]);

mobile/lib/utils/hierarchical_search_util.dart

@@ -336,7 +336,6 @@ Future<List<FaceFilter>> curateFaceFilters(
 
     for (final clusterId in clusterIdToFiles.keys) {
       final files = clusterIdToFiles[clusterId]!;
-      final String clusterName = clusterId;
 
       if (clusterIDToPersonID[clusterId] != null) {
         // This should not happen, means a faceID is assigned to multiple persons.