fixes the signed up icon not getting updated when a new poll is polled (#23961)

code/_onclick/hud/alert.dm

@@ -652,7 +652,7 @@ so as to remain in compliance with the most up-to-date laws."
 			success = poll.sign_up(G)
 		if(success)
 			// Add a small overlay to indicate we've signed up
-			update_signed_up_alert()
+			update_signed_up_alert(usr)
 	else if(target)
 		switch(action)
 			if(NOTIFY_ATTACK)
@@ -682,14 +682,14 @@ so as to remain in compliance with the most up-to-date laws."
 		poll.remove_candidate(G)
 	else
 		poll.sign_up(G)
-	update_signed_up_alert()
+	update_signed_up_alert(G)
 
-/obj/screen/alert/notify_action/proc/update_signed_up_alert()
+/obj/screen/alert/notify_action/proc/update_signed_up_alert(mob/user)
 	if(!signed_up_overlay)
 		signed_up_overlay = image('icons/mob/screen_gen.dmi', icon_state = "selector")
 		signed_up_overlay.layer = FLOAT_LAYER
 		signed_up_overlay.plane = FLOAT_PLANE + 2
-	if(usr in poll.signed_up)
+	if(user in poll.signed_up)
 		overlays += signed_up_overlay
 	else
 		overlays -= signed_up_overlay

code/controllers/subsystem/SSghost_spawns.dm

@@ -96,7 +96,7 @@ SUBSYSTEM_DEF(ghost_spawns)
 			if(P != P2 && P.hash == P2.hash)
 				// If there's already a poll for an identical mob type ongoing and the client is signed up for it, sign them up for this one
 				if(!inherited_sign_up && (M in P2.signed_up) && P.sign_up(M, TRUE))
-					A.update_signed_up_alert()
+					A.update_signed_up_alert(M)
 					inherited_sign_up = TRUE
 				// This number is used to display the number of polls the alert regroups
 				num_stack++