Adds wikipage to zombie antag datum + minor fix (#25712)

* Adds wikipage to zombie antag datum + minor fix

* oops

* okay send it

code/datums/diseases/zombie_virus.dm

@@ -31,9 +31,13 @@
 	if(!..())
 		return FALSE
 	if(HAS_TRAIT(affected_mob, TRAIT_I_WANT_BRAINS) || affected_mob.mind?.has_antag_datum(/datum/antagonist/zombie))
+		SSticker.mode.zombie_infected -= affected_mob
+		if(affected_mob.reagents.has_reagent("zombiecure4"))
+			return
 		handle_rot(TRUE)
 		stage = 7
 		return FALSE
+	SSticker.mode.zombie_infected |= affected_mob
 	switch(stage)
 		if(1) // cured by lvl 1 cure
 			if(prob(4))