Remove the Ninja Forms Add New Form button from wp_editor if non-admin

ninja-forms-remove-add-new.php

<?php
function example_remove_add_new( $instance ) {
	if ( ! current_user_can( 'manage_options' ) ) {
	    remove_filter( 'media_buttons_context', array( $instance->add_form_button, 'insert_form_tinymce_buttons' ) );
	}
}
add_action( 'nf_admin_init', 'example_remove_add_new' );