mod actions: fix ip unban and modreport actions being visible to non-mods.

Fix IP unban actions and moderation report handled/rejected actions
being visible to non-moderators in the mod actions log.

Moderation report actions didn't leak the modreport itself, but it did
leak which moderator handled or rejected it.

app/models/mod_action.rb

@@ -77,7 +77,7 @@ class ModAction < ApplicationRecord
     if user.is_moderator?
       all
     else
-      where.not(category: [:ip_ban_create, :ip_ban_delete])
+      where.not(category: [:ip_ban_create, :ip_ban_delete, :ip_ban_undelete, :moderation_report_handled, :moderation_report_rejected])
     end
   end