tests/test-backwards-remove.t

filemerge: set default labels a little earlier

By setting the default labels a little earlier, we can rely on them
always being set, as far as I can tell. It may actually even be fine
to rely on that even if we don't set them earlier, but it makes more
sense to me to do it.

Differential Revision: https://phab.mercurial-scm.org/D12015

  $ hg init
  $ echo This is file a1 > a
  $ hg add a
  $ hg commit -m "commit #0"
  $ ls -A
  .hg
  a
  $ echo This is file b1 > b
  $ hg add b
  $ hg commit -m "commit #1"
  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

B should disappear

  $ ls -A
  .hg
  a