fix pagination on search

functions.php

function aq_fix_query( $query ) {
    global $paged;
    if( $query->is_main_query() && $query->is_home() ) {
        $query->set( 'post_type', array( 'post', 'listings' ) );
    }
}
add_action( 'pre_get_posts', 'aq_fix_query' );