Returns default AI behavior cooldown to .8 seconds (#60579)

Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>

code/datums/ai/_ai_behavior.dm

@@ -4,8 +4,8 @@
 	var/required_distance = 1
 	///Flags for extra behavior
 	var/behavior_flags = NONE
-	///Cooldown between actions performances
-	var/action_cooldown = 0
+	///Cooldown between actions performances, defaults to the value of CLICK_CD_MELEE because that seemed like a nice standard for the speed of AI behavior
+	var/action_cooldown = CLICK_CD_MELEE
 
 /// Called by the ai controller when first being added. Additional arguments depend on the behavior type.
 /// Return FALSE to cancel