BETA: Fixing minor issue causing some items to stack their skills when switching sub class.
	* Reported by: vampir, thorl2, xbannedx, d!g0
	* Reviewed by: Nos, xban1x

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6415 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad