Easy Digital Downloads - Disallow admins from logging in via the login form

gistfile1.php

<?php

function sumobi_edd_login_form_restrict( $redirect, $user_id ) {

	if ( current_user_can( 'manage_options' ) ) {
		wp_logout();
		edd_set_error( 'admin_login_disabled', __( 'Admins cannot login via this form', 'edd' ) );
	}

	return $redirect;
}
add_filter( 'edd_login_redirect', 'sumobi_edd_login_form_restrict', 10, 2 );