Add notification mode setting

This allows the user to switch between local and push notifications

Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
Reviewed-by: William Casarin <jb55@jb55.com>

damus/damusApp.swift

@@ -73,7 +73,7 @@ class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDele
     func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
         // Return if this feature is disabled
         guard let settings = self.settings else { return }
-        if !settings.enable_experimental_push_notifications {
+        if !settings.enable_experimental_push_notifications || settings.notifications_mode == .local {
             return
         }