test: explicitly run HGEDITOR shell command with `sh`
Otherwise Windows pops up the "What program do you want to use to open this?"
dialog.
--- a/tests/test-prev-next.t Sun Jan 21 16:46:31 2018 -0500
+++ b/tests/test-prev-next.t Sun Jan 21 16:55:02 2018 -0500
@@ -243,7 +243,7 @@
$ hg init repo
$ cd repo
- $ HGEDITOR=${TESTDIR}/fake-editor.sh
+ $ HGEDITOR="sh ${TESTDIR}/fake-editor.sh"
$ echo hi > foo
$ hg ci -Am 'one'
adding foo