Readds borers (#1999)

Readds the cortical borers and also syndi-borers.
Syndi-borers now gives a response if you try to use it multiple times
too quickly, and also prevents usage more than once while it's still
waiting for ghost responses.

code/modules/uplink/uplink_item_cit.dm

@@ -1,4 +1,4 @@
-/*/datum/uplink_item/stealthy_tools/syndi_borer
+/datum/uplink_item/stealthy_tools/syndi_borer
 	name = "Syndicate Brain Slug"
 	desc = "A small cortical borer, modified to be completely loyal to the owner. \
 			Genetically infertile, these brain slugs can assist medically in a support role, or take direct action \
@@ -7,7 +7,7 @@
 	refundable = TRUE
 	cost = 10
 	surplus = 20 //Let's not have this be too common
-	exclude_modes = list(/datum/game_mode/nuclear) */
+	exclude_modes = list(/datum/game_mode/nuclear)
 
 /datum/uplink_item/stealthy_tools/holoparasite
 	name="Holoparasite Injector"