Added guard clause to prevent multiple tunnel creations

from pyngrok import ngrok, conf, exception

def connect(token, port, region):

    # Guard for existing tunnels

    existing = ngrok.get_tunnels()

    if existing:

        public_url = existing[0].public_url

        print(f'ngrok connected to localhost:{port}! URL: {public_url}\n'

               'You can use this link after the launch is complete.')

        return

    account = None

    if token is None:

        token = 'None'