api: remove available_includes dependent on current user.

This is to avoid specifying permissions in multiple disjoint places and
because most API users shouldn't need these fields.

app/models/forum_post.rb

@@ -225,8 +225,6 @@ class ForumPost < ApplicationRecord
   end
 
   def self.available_includes
-    includes_array = [:creator, :updater, :topic, :dtext_links, :votes, :tag_alias, :tag_implication, :bulk_update_request]
-    includes_array << :moderation_reports if CurrentUser.is_moderator?
-    includes_array
+    [:creator, :updater, :topic, :dtext_links, :votes, :tag_alias, :tag_implication, :bulk_update_request]
   end
 end