copies: remove a redundant matcher filtering in _changesetforwardcopies()

We filter before pushing items on the queue, so we don't need to
filter after popping.

Differential Revision: https://phab.mercurial-scm.org/D6560

mercurial/copies.py

@@ -279,8 +279,6 b' def _changesetforwardcopies(a, b, match)'
             copies = {}
             allcopies = set(copies1) | set(copies2)
             for dst in allcopies:
-                if not alwaysmatch and not match(dst):
-                    continue
                 # Unlike when copies are stored in the filelog, we consider
                 # it a copy even if the destination already existed on the
                 # other branch. It's simply too expensive to check if the