[Experimental] [Foliage swaying] Fix extension category (#2146)

- Don't show in changelog

Author: D8H

extensions/community/FoliageSwaying3D.json

@@ -1,6 +1,6 @@
 {
   "author": "",
-  "category": "3D",
+  "category": "Visual effect",
   "dimension": "3D",
   "extensionNamespace": "",
   "fullName": "3D foliage swaying",