restore standard push notification

Signed-off-by: Marino Faggiana <marino@marinofaggiana.com>

Brand/NCBrand.swift

@@ -35,7 +35,7 @@ import UIKit
     @objc public var textCopyrightNextcloudiOS: String = "Nextcloud Liquid for iOS %@ © 2023"
     @objc public var textCopyrightNextcloudServer: String = "Nextcloud Server %@"
     @objc public var loginBaseUrl: String = "https://cloud.nextcloud.com"
-    @objc public var pushNotificationServerProxy: String = "https://c0004.customerpush.nextcloud.com"
+    @objc public var pushNotificationServerProxy: String = "https://push-notifications.nextcloud.com"
     @objc public var linkLoginHost: String = "https://nextcloud.com/install"
     @objc public var linkloginPreferredProviders: String = "https://nextcloud.com/signup-ios"
     @objc public var webLoginAutenticationProtocol: String = "nc://"                                                // example "abc://"