Fix user setting access issue in the notification extension

Notification settings test
--------------------------

PASS

Device: iPhone 15 Pro simulator
iOS: 17.0.1
Damus: This commit
Setup:
- Two phones running Damus on different accounts
- Local relay with strfry-push-notify test setup
- Apple push notification test tool

Coverage:
1. Mention notifications
2. DM notifications
3. Reaction notifications
4. Repost notifications

Steps for each notification type:
1. Trigger a push notification (Resend push notification from test tool)
2. Ensure that the notification is received on the other device
3. Turn off notifications for that type on settings
4. Trigger a push notification (Resend push notification from test tool)
5. Ensure that the notification is not received on the other device

Result: PASS (notifications are received when enabled and not received when disabled)

Closes: https://github.com/damus-io/damus/issues/1764
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
Signed-off-by: William Casarin <jb55@jb55.com>

DamusNotificationService/NotificationExtensionState.swift

@@ -20,9 +20,13 @@ struct NotificationExtensionState: HeadlessDamusState {
     init?() {
         guard let ndb = try? Ndb(owns_db_file: false) else { return nil }
         self.ndb = ndb
-        self.settings = UserSettingsStore()
         
         guard let keypair = get_saved_keypair() else { return nil }
+        
+        // dumb stuff needed for property wrappers
+        UserSettingsStore.pubkey = keypair.pubkey
+        self.settings = UserSettingsStore()
+        
         self.contacts = Contacts(our_pubkey: keypair.pubkey)
         self.muted_threads = MutedThreadsManager(keypair: keypair)
         self.keypair = keypair