MultiServer.py: Another Hint Priority + Item Links bug oh boy

Basically, the hint for an item linked item gets stored in two players' hints.

1. The player whose location it is
2. **Every individual player** participating in the item link

Crucially, it is *not* stored as a hint for the itemlink world.

This makes `replace_hint` not act correctly when a receiving player of an itemlink item tries to change the priority.

I'm not sure if this has other implications, it probably warrants some testing.

MultiServer.py

@@ -792,9 +792,10 @@ class Context:
         return None
     
     def replace_hint(self, team: int, slot: int, old_hint: Hint, new_hint: Hint) -> None:
-        if old_hint in self.hints[team, slot]:
-            self.hints[team, slot].remove(old_hint)
-            self.hints[team, slot].add(new_hint)
+        for real_slot in self.slot_set(slot):
+            if old_hint in self.hints[team, real_slot]:
+                self.hints[team, real_slot].remove(old_hint)
+                self.hints[team, real_slot].add(new_hint)
     
     # "events"
 
@@ -1982,13 +1983,11 @@ async def process_client_cmd(ctx: Context, client: Client, args: dict):
             new_hint = new_hint.re_prioritize(ctx, status)
             if hint == new_hint:
                 return
-
-            concerning_slots = ctx.slot_set(hint.receiving_player) | {hint.finding_player}
-            for slot in concerning_slots:
-                ctx.replace_hint(client.team, slot, hint, new_hint)
+            ctx.replace_hint(client.team, hint.finding_player, hint, new_hint)
+            ctx.replace_hint(client.team, hint.receiving_player, hint, new_hint)
             ctx.save()
-            for slot in concerning_slots:
-                ctx.on_changed_hints(client.team, slot)
+            ctx.on_changed_hints(client.team, hint.finding_player)
+            ctx.on_changed_hints(client.team, hint.receiving_player)
         
         elif cmd == 'StatusUpdate':
             update_client_status(ctx, client, args["status"])