Make toolbar title larger in landscape

By default, title font size is 20dp in portrait and 14dp in landscape:
https://cs.corp.google.com/search/?q=%5C%22abc_text_size_title_material_toolbar%5C%22%5C%3E&m=100&sq=package:android&type=cs

We make it 20dp in both landscape and portrait.

Bug 28625914

Change-Id: I6c609f9ccb6009db4f0ae96bf91aede8597c4ad7