Remove on blur event for email field in checkout

Remove on blur event for email field in checkout

function woo_discount_rules_class_to_refresh_the_checkout_review_on_blur_method($css_classes){
	$css_classes = 'select#billing_state';
	return $css_classes;
}
add_filter('woo_discount_rules_class_to_refresh_the_checkout_review_on_blur', 'woo_discount_rules_class_to_refresh_the_checkout_review_on_blur_method');