[FIX] view_list: hide pager in view group

Displaying the pagert in view group does not make sense as it's not updated when changing filter and every group (even if more than 80) is displayed in view group

addons/web/static/src/js/view_list.js

@@ -1573,6 +1573,7 @@ instance.web.ListView.Groups = instance.web.Class.extend( /** @lends instance.we
                 .filter(function (column) { return column.tag === 'field' })
                 .pluck('name').value(),
             function (groups) {
+                self.view.$pager.hide();
                 $el[0].appendChild(
                     self.render_groups(groups));
                 if (post_render) { post_render(); }