mod reports: include reported user and message in forum post.

Also fix it so that reports against dmails include the key in the dmail
link so that mods can view the reported dmail.

app/models/application_record.rb

@@ -424,7 +424,7 @@ class ApplicationRecord < ActiveRecord::Base
   end
 
   concerning :DtextMethods do
-    def dtext_shortlink
+    def dtext_shortlink(**options)
       "#{self.class.name.underscore.tr("_", " ")} ##{id}"
     end
   end