fix: post type assigment in infinit scroll

The post type was overrided with the value 'post' even if the args had its own value. Now it will act as default value.

inc/views/pluggable/pagination.php

@@ -72,8 +72,12 @@ public function get_posts( \WP_REST_Request $request ) {
 			unset( $args['pagename'] );
 		}
 
-		$args['posts_per_page']      = $per_page;
-		$args['post_type']           = 'post';
+		$args['posts_per_page'] = $per_page;
+
+		if ( empty( $args['post_type'] ) ) {
+			$args['post_type'] = 'post';
+		}
+
 		$args['paged']               = $request['page_number'];
 		$args['ignore_sticky_posts'] = 1;
 		$args['post_status']         = 'publish';