fix vid_cap_from_frm_args None error (#343)

data_juicer/ops/mapper/video_captioning_from_summarizer_mapper.py

@@ -123,7 +123,7 @@ def __init__(self,
         if vid_cap_from_vid_args is None:
             vid_cap_from_vid_args = {}
         if vid_cap_from_frm_args is None:
-            vid_tag_from_frm_args = {}
+            vid_cap_from_frm_args = {}
         if vid_tag_from_aud_args is None:
             vid_tag_from_aud_args = {}
         if vid_tag_from_frm_args is None: