Update lib/PathFinder.php
Update lib/PathFinder.php

Bug: directory separator was added to namespace path 2 times (in rows 266 and 276/281).
Fix: no more double directory separator adding.
svisystem/atk4,svisystem/atk4,samratcis/atk4,svisystem/atk4,atk4/atk4,samratcis/atk4,xepan/atk4,xepan/atk4,atk4/atk4,samratcis/atk4,atk4/atk4,xepan/atk4,atk4/atk4