Bug 1995533: Cannot see skin artefacts via accesscontrol.php

Adding a rule to be able to see skins again

Change-Id: Icdc2f5f76f9c0b4a318a36dc63583e65f4eadc3d
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
(cherry picked from commit 1f3ff909)
(cherry picked from commit 3cbd09b0)