FIX: allow mods to choose restricted categories as parent category.

Currently moderators can't choose a category with only “See” permission as a parent in `edit-category` modal.

app/assets/javascripts/discourse/app/templates/components/edit-category-general.hbs

@@ -18,6 +18,7 @@
         categories=parentCategories
         allowSubCategories=true
         allowUncategorized=false
+        allowRestrictedCategories=true
         onChange=(action (mut category.parent_category_id))
       }}
     </section>

app/assets/javascripts/select-kit/addon/components/category-chooser.js

@@ -138,7 +138,7 @@ export default ComboBoxComponent.extend({
       }
 
       const permissionType = this.selectKit.options.permissionType;
-      if (permissionType) {
+      if (permissionType && !this.allowRestrictedCategories) {
         return permissionType === category.permission;
       }