[native] only display remove device button if current device is primary device

Summary: pretty self-explanatory. only the primary device should be able to remove other devices. we hide the remove device button if user is not on their primary device.

Test Plan: confirmed that the button only appears if i'm on my primary device

Reviewers: ashoat, tomek, varun

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D13262