[Updated] D11876: filemerge: rename backup variables from `back` to `backup`

[martinvonz (Martin von Zweigbergk)]

martinvonz requested review of this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D11876/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D11876

To: martinvonz, #hg-reviewers, Alphare
Cc: mercurial-patches
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