phab-refresh: do not pick draft changeset from the bare "default" branch
My initial test overlooked a common case: draft changeset on the default branch.
So right now, heptapod is doing a final refresh of the patch with the landed
version. This is not a bit problem except for the extra noise. However we would
be better without the noise.
Differential Revision: https://phab.mercurial-scm.org/D9522
cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh=$PYTHON "$RUNTESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF