BETA: Reworked `DecayTaskManager`.
	* Changed "too old corpse" condition on retail its 2 seconds before corpse disappears.
	
Reviewed by: !UnAfraid, !Adry_85

git-svn-id: http://svn.l2jserver.com/branches/unstable/L2J_Server_BETA@6396 d34dfa0f-f91c-0410-86dd-cf06f19dd0ad