Fix current_user_can issue

Hi there!

i noticed a problem, if user role < than administrator, it can’t edit pages (e.g. Editor user role). To fix an issue, replace

if ( ! current_user_can( 'manage_options' ) )
  wp_die( __( 'You do not have sufficient permissions to manage options for this site.' ) );

with

if ( ! current_user_can( 'manage_options' ) ) {
 return;
}

in \integration-with-hubspot-forms\templates\popup.php file