Disable NEXTgen scripts and styles

Hello, after searching for hours, I have all of the following code loaded into my functions.php from various solutions posted:

function theme_scripts() {
	define('NGG_SKIP_LOAD_SCRIPTS', true);

}
add_action( 'wp_enqueue_scripts', 'theme_scripts' );

add_action('wp_print_scripts', 'wpse_82982_removeScripts');
add_action('wp_print_styles', 'wpse_82982_removeStyles');

function wpse_82982_removeScripts() {
    wp_dequeue_script('ngg-slideshow');
    wp_dequeue_script('shutter');
}

function wpse_82982_removeStyles() {
    wp_dequeue_style('NextGEN');
    wp_dequeue_style('shutter');
}

remove_action ('wp_head','nggGalleryViewHead');

define('NGG_SKIP_LOAD_SCRIPTS', true);

However, none of them work. Does anyone know how to disable NEXTgen scripts and styles?

https://wordpress.org/plugins/nextgen-gallery/