Add public as requirement to show include box on merge field

Author: MaxwellGarceau

views/setup_page.php

@@ -303,7 +303,7 @@ function ( $ele ) {
 								<td><?php echo esc_html( ( 1 === $mv_var['required'] ) ? 'Y' : 'N' ); ?></td>
 								<td>
 									<?php
-									if ( ! $mv_var['required'] ) {
+									if ( ! $mv_var['required'] && $mv_var['public'] ) {
 										$opt = 'mc_mv_' . $mv_var['tag'];
 										?>
 										<label class="screen-reader-text" for="<?php echo esc_attr( $opt ); ?>">