Fix video player width not being updated to fit container width (#10069)

app/javascript/mastodon/features/video/index.js

@@ -347,7 +347,6 @@ class Video extends React.PureComponent {
       width  = containerWidth;
       height = containerWidth / (16/9);
 
-      playerStyle.width  = width;
       playerStyle.height = height;
     }