fix: Implement applicationKey regeneretion on reupload key after restoration

lib/logic/cubit/backups/backups_cubit.dart

@@ -113,13 +113,21 @@ class BackupsCubit extends ServerInstallationDependendCubit<BackupsState> {
     if (bucket == null) {
       emit(state.copyWith(isInitialized: false));
     } else {
+      String login = bucket.applicationKeyId;
+      String password = bucket.applicationKey;
+      if (login.isEmpty || password.isEmpty) {
+        final BackblazeApplicationKey key =
+            await backblaze.createKey(bucket.bucketId);
+        login = key.applicationKeyId;
+        password = key.applicationKey;
+      }
       final GenericResult result = await api.initializeRepository(
         InitializeRepositoryInput(
           provider: BackupsProviderType.backblaze,
           locationId: bucket.bucketId,
           locationName: bucket.bucketName,
-          login: bucket.applicationKeyId,
-          password: bucket.applicationKey,
+          login: login,
+          password: password,
         ),
       );
       if (result.success == false) {