test-removeemptydirs: adjust to Windows behavior for the `histedit` case
Windows stay in the "same" directory and the warning message is not applicable.
This make `tests/test-removeemptydirs.t` pass on Windows.
Differential Revision: https://phab.mercurial-scm.org/D11055
cat >> $HGRCPATH <<EOF
[extensions]
narrow=
[ui]
ssh="$PYTHON" "$RUNTESTDIR/dummyssh"
[experimental]
changegroup3 = True
EOF