feat(games): wire pruneDeadTokens into onGameSessionUpdate

functions/src/games/onGameSessionUpdate.ts

@@ -1,6 +1,7 @@
 import * as functions from 'firebase-functions'
 import * as admin from 'firebase-admin'
 import { recipientInQuietHours } from '../notifications/quietHours'
+import { pruneDeadTokens } from '../notifications/pruneTokens'
 
 /**
  * Firestore trigger that notifies partners when a game session is created or completed.
@@ -336,4 +337,6 @@ async function notifyPartner(
   } else {
     console.log(`[notifyPartner] notified ${partnerId} (${notificationType})`)
   }
+
+  await pruneDeadTokens(db, partnerId, tokens, sendResults)
 }