Refactor dropdown and action modal code slightly

Simplify it a bit and make it closer to upstream

app/javascript/flavours/glitch/containers/dropdown_menu_container.js

@@ -18,11 +18,12 @@ const mapDispatchToProps = (dispatch, { status, items, scrollKey }) => ({
         (item, i) => item ? {
           ...item,
           name: `${item.text}-${i}`,
-          onClick: item.action ? ((e) => { return onItemClick(i, e) }) : null,
         } : null
       ),
+      onClick: onItemClick,
     }) : openDropdownMenu(id, dropdownPlacement, keyboard, scrollKey));
   },
+
   onClose(id) {
     dispatch(closeModal('ACTIONS'));
     dispatch(closeDropdownMenu(id));