tests/test-absorb-phase.t

subrepo: use root-repo-relative path from `hg files` with ui.relative-paths=no

The fix is to pass in a "subuipathfn" as we do everywhere else.

Differential Revision: https://phab.mercurial-scm.org/D5978

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > absorb=
  > drawdag=$TESTDIR/drawdag.py
  > EOF

  $ hg init
  $ hg debugdrawdag <<'EOS'
  > C
  > |
  > B
  > |
  > A
  > EOS

  $ hg phase -r A --public -q
  $ hg phase -r C --secret --force -q

  $ hg update C -q
  $ printf B1 > B

  $ hg absorb -aq

  $ hg log -G -T '{desc} {phase}'
  @  C secret
  |
  o  B draft
  |
  o  A public