Fixes AIs removing beakers from IV Drips

Thanks to Krausus for the general idea on how to do this without adding
an exception just for the AI.

- AIs can no longer interact with IV Drips (unless their core is
literally adjacent to it);
- Human mobs and Robotics can still interact with IV Drips (robots can
no longer interact with them at a distance

🆑
tweak: AI can no longer interact with IV Drips at a distance
tweak: Robots can no longer interact with IV Drips at a distance
/🆑

code/game/machinery/iv_drip.dm

@@ -132,6 +132,8 @@
 				update_icon()
 
 /obj/machinery/iv_drip/attack_hand(mob/user as mob)
+	if((get_dist(src, user) > 1))
+		return //stops the AI from removing beakers, still allows borgs
 	if(src.beaker)
 		src.beaker.loc = get_turf(src)
 		src.beaker = null