Session::loadService: fix bug on windows release

Change-Id: I5d8a80d11e6a445eb58d085523505b2acce73fb5
Reviewed-on: http://gerrit.aldebaran.lan/45967
Tested-by: gerrit
Reviewed-by: pdaouadi <pdaouadi@aldebaran-robotics.com>
Tested-by: pdaouadi <pdaouadi@aldebaran-robotics.com>