tests: fix failure of test-convert-mtn.t
This is follow up for 3f9e25a42e69, which overlooked this test.
--- a/tests/test-convert-mtn.t Sat Mar 26 18:12:12 2016 +0900
+++ b/tests/test-convert-mtn.t Sat Mar 26 10:53:31 2016 +0900
@@ -260,6 +260,9 @@
$ cd repo.mtn-hg
$ hg up -C
12 files updated, 0 files merged, 0 files removed, 0 files unresolved
+ updated to a closed branch head, because all descendant heads are closed.
+ beware of re-opening closed head by subsequent commit here.
+ all heads for branch "com.selenic.test" are closed.
$ glog
@ 14 "largefile" files: large-file
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