D5056: closehead: use correct format string for rev numbers

[pulkit (Pulkit Goyal)]

pulkit added a comment.


  I took care of this in https://phab.mercurial-scm.org/D5040 ;)

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D5056

To: mbthomas, #hg-reviewers, pulkit
Cc: mercurial-devel