BETA: Fixed a bug where skills vs `L2DoorInstance` and `L2SiegeFlagInstance` were doing nothing while only continuous skills should not be applied on them.

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6402 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad