Center TopMenu when AppBanner is hidden
Center TopMenu when AppBanner is hidden

When the AppBanner is hidden, the TopMenu in the TopMenuModule should be
centered.

https://phabricator.endlessm.com/T10779

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib