largefiles: don't prefix standin patterns with '.hglf' when logging When logging '.hglf/foo', the pattern list was being transformed from ['.hglf/foo'] into ['.hglf/foo', '.hglf/.hglf/foo']. Aside from the pathological case of somebody getting a directory named '.hglf' created inside the standing directory, the old code shouldn't have had any bad effects. (amended by mpm to sort patterns for test stability and not upset check-code)