[native] Set SIWE backup secrets during restoration

Summary:
We should set these secrets to make sure a new backup message isn't generated.

https://linear.app/comm/issue/ENG-10073/avoid-generating-a-new-backup-message-after-restoration

Depends on D14183

Test Plan: Restore a SIWE user and check that the missing SIWE message modal isn't shown.

Reviewers: kamil, bartek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D14186