BETA: Fixed `TriggerSkillByDamage` effect it should not work for damage taken over time.

Reported by: facheme
Reviewed by: St3et

git-svn-id: http://svn.l2jdp.com/branches/unstable/L2J_DataPack_BETA@10153 5288da4f-0efc-0310-bd40-8d490a2659fa