serverminitopic: wrap context.changectx.branch instead of context.changectx Recently some changes in core resulted in this wrapping of class leading to an infinite recursion. Let's wrap the particular function instead of wrapping the whole command. This fixes test-minitopic.t which was breaking.

test-drop.t
test-inhibit.t
test-simple4server.t
tests/test-simple4server-bundle2.t