[Unity][Android] Update margins in sign-in and consent bump screens

This CL updates the layout of the streamlined sign-in screen and the
consent bump screen to accommodate last changes to mocks.

Bug: 814728
Change-Id: If8f2cdaf39ba175ca60584f9015a4b2ccaf23217
Reviewed-on: https://chromium-review.googlesource.com/1171226
Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582388}
3 files changed