Fix pickup and dropoff location case

Summary:
Fix support for rentalcars.com embed schema.org script

According to https://developers.google.com/gmail/markup/reference/rental-car
pickUpLocation -> pickupLocation
dropOffLocation -> dropoffLocation

Reviewers: mlaurent, vkrause

Reviewed By: vkrause

Subscribers: kde-pim

Tags: KDE PIM

Differential Revision: https://phabricator.kde.org/D14995