Small bug with {{Summary2}}

[sdkb]

When warning a user with {{Summary2}}, there's a box for putting in a linked article. The template does not support linking any specific article (nor do I think it should, since it's designed to warn about a broad behavioral pattern), so this should be removed.

[NovemLinguae]

Note: Need to add something to Twinkle.warn.callback.change_subcategory to show or hide the field.