fix JS error "chill is not defined"

This happens since js is loaded using "defer" tag

src/Bundle/ChillMainBundle/Resources/views/layout.html.twig

@@ -164,9 +164,11 @@
       {{ encore_entry_script_tags('ckeditor5') }}
     {% endif %}
     <script type="text/javascript">
+      window.addEventListener('DOMContentLoaded', function(e) {
         chill.checkOtherValueOnChange();
         $('.select2').select2({allowClear: true});
         chill.categoryLinkParentChildSelect();
+      });
     </script>
     {% block js%}<!-- nothing added to js -->{% endblock %}
 </body>