Borg and dionae vines fixes (#3758)

Fixes emmaged borgs being locked down by the robotics console.
Also, fixes a dionae structure being dense, turnings dionae mazes into a pain to use.

code/game/machinery/computer/robot.dm

@@ -85,6 +85,9 @@
 			user << "Access Denied."
 			return
 
+		if(target.emagged)
+			return
+
 		var/choice = input("Really [target.lockcharge ? "unlock" : "lockdown"] [target.name] ?") in list ("Yes", "No")
 		if(choice != "Yes")
 			return

code/modules/random_map/automata/diona.dm

@@ -24,6 +24,7 @@
 	name = "alien vines"
 	desc = "Thick, heavy vines of some sort."
 	icon_state = "vines3"
+	density = 0
 	var/growth = 0
 
 /obj/structure/diona/vines/proc/spread()