[extractors] Remove superfluous whitespace

youtube_dl/extractor/extractors.py

@@ -1400,7 +1400,7 @@ from .webofstories import (
     WebOfStoriesPlaylistIE,
 )
 from .weibo import (
-    WeiboIE, 
+    WeiboIE,
     WeiboMobileIE
 )
 from .weiqitv import WeiqiTVIE