[native] fix copy in FarcasterPrompt

Summary:
In D11484 I accidentally removed the question mark in "Do you want to connect your Farcaster account?" This diff fixes that

Depends on D11613

Test Plan:
Please see screenshot below

Reviewers: atul, inka

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11621