Remove city database to reduce package size

inc/helpers/validation-rules/class-domain.php

@@ -43,8 +43,7 @@ class Domain extends Rule {
 	 *
 	 * @param mixed $value Value being checked.
 	 */
-  public function check($value) : bool { // phpcs:ignore
-
+	public function check($value) : bool { // phpcs:ignore
 		return (bool) preg_match('/^(?!\-)(?:(?:[a-zA-Z\d][a-zA-Z\d\-]{0,61})?[a-zA-Z\d]\.){1,126}(?!\d+)[a-zA-Z\d]{1,63}$/', (string) $value);
 	}
 }