tests/test-journal-exists

Don't use sed -r; instead use old-style regexp

Rev d895158fe8af introduced some sed -r tests, but -r is only available on GNU
sed, while BSD sed uses -E. Better to use old-style regular expressions, that
way the tests work on all sed variants.

#!/bin/sh

hg init
echo a > a
hg ci -Am0

touch .hg/store/journal

echo foo > a
hg ci -Am0

hg recover