[native] Fix Comm swoosh render in RegistrationTerms on iOS release builds

Summary:
For some reason, center works on iOS debug builds, but not release builds. This diff makes it look good on release builds.

center is probably closer to what we want than contain, but they have the same behavior because the swoosh is larger than the screen width and as such doesn't need to be centered.

Depends on D13311

Test Plan:

before	after

Reviewers: varun, will

Reviewed By: varun

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13312