rebase: fix a typo in test-rebase-obsolete
We had left a lonely single quote where it shouldn't be!
--- a/tests/test-rebase-obsolete.t Wed Nov 18 20:59:17 2015 -0600
+++ b/tests/test-rebase-obsolete.t Wed Nov 18 13:46:42 2015 -0800
@@ -11,7 +11,7 @@
> evolution=createmarkers,allowunstable
> [phases]
> publish=False
- > [extensions]'
+ > [extensions]
> rebase=
> EOF