Remove Save & Preview button from Ambassadors campaign submission form

submit-campaign-buttons.php

<?php 

if ( ! $form->is_final_page() ) {
    return $form->get_page_submit_button();         
}

if ( false === $form->get_campaign() || 'draft' == $form->get_campaign()->post_status ) {
    $primary_text = apply_filters( 'charitable_ambassadors_form_submission_buttons_primary_new_text', __( 'Submit Campaign', 'charitable-ambassadors' ), $form );
}
else {
    $primary_text = apply_filters( 'charitable_ambassadors_form_submission_buttons_primary_update_text', __( 'Update Campaign', 'charitable-ambassadors' ), $form );
}

printf( '<input class="button button-primary" type="submit" name="submit-campaign" value="%s" />', esc_attr( $primary_text ) );