fix alliance expired message (#1323)

## Description:

The alliance expired update wasn't triggering the method.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

DISCORD_USERNAME

src/client/graphics/layers/EventsDisplay.ts

@@ -152,6 +152,7 @@ export class EventsDisplay extends LitElement implements Layer {
     [GameUpdateType.TargetPlayer, (u) => this.onTargetPlayerEvent(u)],
     [GameUpdateType.Emoji, (u) => this.onEmojiMessageEvent(u)],
     [GameUpdateType.UnitIncoming, (u) => this.onUnitIncomingEvent(u)],
+    [GameUpdateType.AllianceExpired, (u) => this.onAllianceExpiredEvent(u)],
   ]);
 
   constructor() {