fix: ensure to expose client assets

Author: wilr

composer.json

@@ -35,7 +35,10 @@
     "extra": {
         "branch-alias": {
             "dev-main": "2.x-dev"
-        }
+        },
+        "expose": [
+            "client"
+        ]
     },
     "replace": {
         "silverstripe/forum": "self.version"

src/PageTypes/Forum.php

@@ -233,7 +233,7 @@ public function getCMSFields()
 
             $categories = ForumCategory::get()->map();
 
-            $fields->addFieldsToTab(
+            $fields->addFieldToTab(
                 "Root.Main",
                 DropdownField::create('CategoryID', _t('Forum.FORUMCATEGORY', 'Forum Category'), $categories),
                 'Content'