largefiles: drop a redundant check for patterns when removing without --after
This is in the way of passing a matcher to removelargefiles(). This method is
called in exactly two places- first in overrides.addremove() (but only if the
pattern list passed to it is not empty), and second in the commands.remove()
override. But since the latter calls commands.remove() first, which also does
this check, it isn't needed here.
Testing that hghave does not crash when checking features
$ "$TESTDIR/hghave" --test-features 2>/dev/null