In MDL-74087 breadcrumbs were removed from the User preferences page.
This patch re-introduces a piece of code that was removed originally
in MDL-73233 while reviewing all the places where the Dashboard was
displayed by default (to avoid inconsistencies). New item in primary
navigation has been changed to "Home" but we still need the code
re-added to hide breadcrumbs when its content matches the primary
navigation.
30b75b7190