[2020] Forum missing maintenance announcement box

@ZOS_GinaBruno @ZOS_JessicaFolsom

Not sure if you're aware of it, but the maintenance announcement box on the top only displayed on the main forum page (https://forums.elderscrollsonline.com/en/) and its is not visible on the thematic groups (like https://forums.elderscrollsonline.com/en/post/discussion/general-discussion and such)

Could we get them back on the general discussion and other group pages please as that's what most people actually looking at.