[Messaging] - Remove trailing whitespace (#1784)

Author: devPaidion

messaging/MessagingExampleSwift/AppDelegate.swift

@@ -117,7 +117,7 @@ extension AppDelegate: UNUserNotificationCenterDelegate {
 
     // Print full message.
     print(userInfo)
-        
+
     // Change this to your preferred presentation option
     // Note: UNNotificationPresentationOptions.alert has been deprecated.
     if #available(iOS 14.0, *) {