[native] fix create roles screen bottom of permissions list being cut off

Summary:
When a user scrolled all the way down on the Permissions list in the Create Role screen, the Manage Invite Links’ description is cut off. This diff adds some padding to the contentContainerStyle of the ScrollView which resolves that visual bug

Linear task: https://linear.app/comm/issue/ENG-6355/permissions-list-in-create-role-screen-is-misaligned

Test Plan:
Please see the demo videos below

before:

after:

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D10989