tests: switch test from '--config ui.editor=~/foo' to HGEDITOR=~/foo
The test is currently not testing anything, the '--config ui.editor=~/path'
argument is apparently of lower priority than the HGEDITOR that run-tests.py is
setting.
Differential Revision: https://phab.mercurial-scm.org/D1809
Issue351: mq: qrefresh can create extra revlog entry
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ hg qinit
$ echo b > b
$ hg ci -A -m foo
adding b
$ echo cc > b
$ hg qnew -f foo.diff
$ echo b > b
$ hg qrefresh
$ hg debugindex b
rev offset length ..... linkrev nodeid p1 p2 (re)
0 0 3 ..... 0 1e88685f5dde 000000000000 000000000000 (re)