Make sure top menu module's children are vertically centered
Make sure top menu module's children are vertically centered

When we allocate a rect for them, we need to make sure
we count starting from the parent's y offset.

https://phabricator.endlessm.com/T10795

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