[native] Reduce spacing between wordmark and user input for short Androids
[native] Reduce spacing between wordmark and user input for short Androids

Summary: The spacing between `LogInPanel` and `RegisterPanel` is too much for short Android screens. This change makes it look more natural.

Test Plan: Visual inspection on Nexus 4 emulator

Reviewers: atul, palys-swm

Reviewed By: palys-swm

Subscribers: KatPo, Adrian

Differential Revision: https://phabricator.ashoat.com/D1464

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