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copies: remove most early returns from pathcopies() and _forwardcopies()

Authored by martinvonz.

Description

copies: remove most early returns from pathcopies() and _forwardcopies()

I want to split up _chainandfilter() more so the call to _filter()
consistently happens at the end of pathcopies(). This prepares for
that change.

Differential Revision: https://phab.mercurial-scm.org/D6601