test_list_references: update to reflect new repo structure

Author: Edward Thomson

test/reference_test.rb

@@ -29,10 +29,12 @@ def test_list_references
       "refs/heads/ident",
       "refs/heads/long-file-name",
       "refs/heads/master",
+      "refs/heads/merge-conflict",
       "refs/heads/packed",
       "refs/heads/packed-test",
       "refs/heads/subtrees",
       "refs/heads/test",
+      "refs/heads/testrepo-worktree",
       "refs/tags/e90810b",
       "refs/tags/foo/bar",
       "refs/tags/foo/foo/bar",