Author list Posts and Galleries

Hi everybody,
i’m trying to display a list of posts and galleries (instead of only posts). The link is https://www.site.ext/author/nameoftheauthor
I’m using a theme (Quadrum by orange themes) that i’ve found that is using the “news.php” template.
I’ve added a filter

//news.php
<?php
	if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

	wp_reset_query();

	if(is_author()){

		add_filter( 'posts_where' , 'getposts_where_filter');
	}
?>
<?php get_template_part(THEME_LOOP."loop","start"); ?>
	<?php get_template_part(THEME_SINGLE."page","title"); ?>
	<?php $counter = 1;?>
	<?php get_template_part(THEME_SINGLE."page","header"); ?>
		<div class="blog-style">
			<?php if (have_posts()) : while (have_posts()) : the_post(); ?>
				<?php get_template_part(THEME_LOOP."post"); ?>
			<?php $counter++; ?>
			<?php endwhile; else: ?>
				<?php get_template_part(THEME_LOOP."no","post"); ?>
			<?php endif; ?>
			<?php customized_nav_btns($paged, $wp_query->max_num_pages); ?>
		</div>
	<?php get_template_part(THEME_SINGLE."page","footer"); ?>
<?php get_template_part(THEME_LOOP."loop","end"); ?>

The filter is

function getposts_where_filter( $where) {

	echo "<!-- PRE CHANGE".$where." -->";
	if(strpos($where, "AND wp_posts.post_type = 'post'") !== false){
		$where = str_replace("AND wp_posts.post_type = 'post'", "AND (wp_posts.post_type = 'post' OR wp_posts.post_type = 'gallery')", $where);
	} else {
		$where .= " AND wp_posts.post_type = 'gallery'";
	}
	echo "<!-- POST CHANGE".$where." -->";
	return $where;
}

And it prints

<!-- PRE CHANGE AND ( wp_term_relationships.term_taxonomy_id IN (3218) ) AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') -->
<!-- POST CHANGE  AND ( wp_term_relationships.term_taxonomy_id IN (3218) ) AND (wp_posts.post_type = 'post' OR wp_posts.post_type = 'gallery') AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') -->

But it still displays only posts… where am i wrong?
Do you need more specifications or files?
Thank you for the support.
Leandro