[native] Fix the styling of the QR URL screen on virtual devices
Summary:
Update the styling.
https://linear.app/comm/issue/ENG-10168/improve-qr-login-flow-on-dev
Depends on D14314
Test Plan: Check if the field is displayed correctly.
Reviewers: kamil, bartek
Reviewed By: kamil
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D14315