Fix unknown config warning

Author: mrrobot47

src/Site_Command.php

@@ -276,7 +276,7 @@ public function delete( $args ) {
 	 */
 	private function init_le() {
 		$client        = new Site_Letsencrypt();
-		$this->le_mail = EE::get_config( 'le-mail' ) ?? EE::input( 'Enter your mail id: ' );
+		$this->le_mail = EE::get_runner()->config[ 'le-mail' ] ?? EE::input( 'Enter your mail id: ' );
 		if ( ! $client->register( $this->le_mail ) ) {
 			$this->le = false;