[mob][photos] Fix 400 on embedding fetch

mobile/lib/services/machine_learning/face_ml/face_ml_service.dart

@@ -446,7 +446,7 @@ class FaceMlService {
 
         if (LocalSettings.instance.remoteFetchEnabled) {
           try {
-            final List<int> fileIds = [];
+            final Set<int> fileIds = {}; // if there are duplicates here server returns 400
             // Try to find embeddings on the remote server
             for (final f in chunk) {
               fileIds.add(f.uploadedFileID!);

mobile/lib/services/machine_learning/file_ml/remote_fileml_service.dart

@@ -55,13 +55,13 @@ class RemoteFileMLService {
   }
 
   Future<FilesMLDataResponse> getFilessEmbedding(
-    List<int> fileIds,
+    Set<int> fileIds,
   ) async {
     try {
       final res = await _dio.post(
         "/embeddings/files",
         data: {
-          "fileIDs": fileIds,
+          "fileIDs": fileIds.toList(),
           "model": 'file-ml-clip-face',
         },
       );