locate: explicitly use dirstate.matches() for working copy
`hg locate` is odd in that it includes files that have been removed
from the working copy. It relies on workingctx.matches() for that. I
want to make workingctx.matches() not include removed files, so this
patch makes `hg locate` handle the working copy differently instead.
Differential Revision: https://phab.mercurial-scm.org/D3710
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