scm: mercurial: add one "closed" branch to test repository (#16177)

git-svn-id: http://svn.redmine.org/redmine/trunk@12929 e93f8b46-1217-0410-a6f0-8f06a7374b81
Mercurial 2.9 compatibility (#16177)

git-svn-id: http://svn.redmine.org/redmine/trunk@12930 e93f8b46-1217-0410-a6f0-8f06a7374b81