tests: simplify config in test-rebase-detach.t

Differential Revision: https://phab.mercurial-scm.org/D93

tests/test-rebase-detach.t

@@ -2,11 +2,8 b''
   > [extensions]
   > rebase=
   > 
-  > [phases]
-  > publish=False
-  > 
   > [alias]
-  > tglog = log -G --template "{rev}: '{desc}' {branches}\n"
+  > tglog = log -G --template "{rev}: '{desc}'\n"
   > EOF