[native] [refactor] [ENG-530] refactor container margin bottom if statement

Summary:
use if else syntax the that's used project wide.

before:

after:

Test Plan: Cluster margin should work as expected in chat view.

Reviewers: atul, palys-swm, def-au1t, dereknelson

Reviewed By: palys-swm

Subscribers: ashoat, Adrian, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3997