Fix two extra robust bugs

Trays have no attack cooldown because they have this crazy-long snowflake code for attacks.

Beds (and children like chairs) don't track target for grab-buckle do_after, letting them run away and get teleported back to the chair and buckled regardless of their efforts.

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -133,7 +133,7 @@
 			user  << "<span class='notice'>\The [src] already has someone buckled to it.</span>"
 			return
 		user.visible_message("<span class='notice'>[user] attempts to buckle [affecting] into \the [src]!</span>")
-		if(do_after(user, 20))
+		if(do_after(user, 20, G.affecting))
 			affecting.loc = loc
 			spawn(0)
 				if(buckle_mob(affecting))