[fix] Typo in pretrain train+val config of visual bert (#541)

Summary:
fix typo in the name of the features files

Pull Request resolved: #541

Reviewed By: vedanuj

Differential Revision: D23504310

Pulled By: apsdehal

fbshipit-source-id: 9e3055a5150c98b8535edf3389804f6ecf509357

projects/visual_bert/configs/masked_coco/pretrain_train_val.yaml

@@ -8,8 +8,8 @@ dataset_config:
     use_features: true
     features:
       train:
-      - coco/defaults/features/coco_trainval2014.lmdb
-      - coco/defaults/features/coco_trainval2014.lmdb
+      - coco/defaults/features/trainval2014.lmdb
+      - coco/defaults/features/trainval2014.lmdb
     annotations:
       train:
       - coco/defaults/annotations/imdb_karpathy_train_by_image.npy