Deduplicate functions

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

WireGuard/WireGuard/Tunnel/TunnelsManager.swift

@@ -45,7 +45,7 @@ enum TunnelsManagerActivationError: WireGuardAppError {
     var alertText: AlertText {
         switch self {
         case .activationFailed:
-            return ("Activation failure", "The tunnel could not be activated. Please ensure you are connected to the Internet.")
+            return ("Activation failure", "The tunnel could not be activated. Please ensure that you are connected to the Internet.")
         case .activationFailedWithExtensionError(let title, let message):
             return (title, message)
         }

WireGuard/WireGuard/UI/iOS/ErrorPresenter.swift

@@ -6,16 +6,8 @@ import os.log
 
 class ErrorPresenter {
     static func showErrorAlert(error: WireGuardAppError, from sourceVC: UIViewController?, onPresented: (() -> Void)? = nil, onDismissal: (() -> Void)? = nil) {
-        guard let sourceVC = sourceVC else { return }
-
         let (title, message) = error.alertText
-        let okAction = UIAlertAction(title: "OK", style: .default) { _ in
-            onDismissal?()
-        }
-        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
-        alert.addAction(okAction)
-
-        sourceVC.present(alert, animated: true, completion: onPresented)
+        showErrorAlert(title: title, message: message, from: sourceVC, onPresented: onPresented, onDismissal: onDismissal)
     }
 
     static func showErrorAlert(title: String, message: String, from sourceVC: UIViewController?, onPresented: (() -> Void)? = nil, onDismissal: (() -> Void)? = nil) {