[Rivet] fix for bug in lhef to hepmc conversion

[Christian Gumpert]

Dear Rivet authors,

we have been using your helper tool 'lhef2hepmc' 
(http://rivet.hepforge.org/svn/contrib/lhef2hepmc@4330)  for converting 
generator output. We recognized that there was a problem in the transfer 
of the cross section information for samples generated with the option 
IDWTUP = 3. I attached a simple fix for this problem to this mail.
We would kindly ask you for including this fix in this very helpful 
conversion tool.

Thanks
Christian
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