[native] Let the user dismiss the SIWEPanel with a gesture
Summary: We need to make sure we trigger goBackToPrompt when the user dismisses the BottomSheet.
Test Plan: Dismiss the BottomSheet and make sure LoggedOutModal goes back to the prompt
Reviewers: atul
Reviewed By: atul
Subscribers: tomek
Differential Revision: https://phab.comm.dev/D6009