fix a type conflict?

I'm pretty sure that this made this stricter, so I'm fine with it…

Author: hawkrives

source/views/menus/lib/process-menu-shorthands.js

@@ -5,8 +5,8 @@ import type {MenuItemType, StationMenuType} from '../types'
 type BasicMenuItemType = {
   label: string,
   station: string,
-  special?: boolean,
-  description?: string,
+  special: boolean,
+  description: string,
 }
 
 type BasicStationMenuType = {