forms: category manual ordering on management forms page (#48539)

wcs/backoffice/management.py

@@ -769,7 +769,8 @@ class ManagementDirectory(Directory):
     def display_forms(self, forms_list):
         r = TemplateIO(html=True)
         r += htmltext('<ul class="biglist">')
-        cats = Category.select(order_by = 'name')
+        cats = Category.select()
+        Category.sort_by_position(cats)
         for c in cats + [None]:
             if c is None:
                 l2 = [x for x in forms_list if not x[0].category_id]