largefiles: delete unnecessary meddling with matcher internals
lfutil.getstandinmatcher() was setting match._always to False because
it wanted a matcher of no patterns to match no files and match.match()
instead matches everything. However, since
ba8089433090 (largefiles:
ensure lfutil.getstandinmatcher() only matches standins, 2015-08-12),
it never actually passes an empty list of patterns, so the hack has
become unnecessary.
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