Remove drop target text in landscape

- Vertical text currently has wrapping issues and is unnecessary
- Text was being shown on all tablet devices

Screenshot of wrapping issue:
https://docs.google.com/file/d/0B9gh9VnHidOdOWdUdHdrY0VQdEE/edit

Change-Id: Ibcca6956e21f6441a6ef7baee3a8b7d8dcbd89f9