revset: drop some unused code in the `remote` revset
PyCharm flagged the `revs = [..]` as an unused assignment. But then neither
`revs` nor `checkout` is used, and I can't see where `hg.addbranchrevs()` has
external side effects.
Differential Revision: https://phab.mercurial-scm.org/D7764
$ hg init
$ echo a > a
$ hg ci -Am t
adding a
$ hg mv a b
$ hg ci -Am t1
$ hg debugrename b
b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
$ hg mv b a
$ hg ci -Am t2
$ hg debugrename a
a renamed from b:37d9b5d994eab34eda9c16b195ace52c7b129980
$ hg debugrename --rev 1 b
b renamed from a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3