Remove incorrect comment.

UpdateColumnWidthToFit() is in fact used when double-clicking columns separators.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66739 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/datavgen.cpp

@@ -145,7 +145,6 @@ protected:
         return *(GetOwner()->GetColumn(idx));
     }
 
-    // FIXME: currently unused
     virtual bool UpdateColumnWidthToFit(unsigned int idx, int widthTitle)
     {
         wxDataViewCtrl * const owner = GetOwner();