remotefilelog: remove obsolete filtering of treemanifest directories

I think this has been obsolete since 2cf18f46a1ce (narrow: only walk
files within narrowspec also for committed revisions, 2018-09-28).

Differential Revision: https://phab.mercurial-scm.org/D6531

hgext/remotefilelog/__init__.py

@@ -990,9 +990,6 b' def _fileprefetchhook(repo, revs, match)'
             mf = ctx.manifest()
             sparsematch = repo.maybesparsematch(ctx.rev())
             for path in ctx.walk(match):
-                if path.endswith('/'):
-                    # Tree manifest that's being excluded as part of narrow
-                    continue
                 if (not sparsematch or sparsematch(path)) and path in mf:
                     allfiles.append((path, hex(mf[path])))
         repo.fileservice.prefetch(allfiles)