Make LodgingBusiness and FoodEstablishment inherit from Organization instead of Place

Summary:
As discussed on IRC, it makes more sense, and it's not worth going the
multiple inheritance route.

Test Plan: Compile and make test

Reviewers: vkrause

Reviewed By: vkrause

Subscribers: KDE PIM, vkrause

Tags: KDE PIM

Differential Revision: https://phabricator.kde.org/D12179