[Cashtab][Move msg switch p1] Move multi recipients switch out of the Advanvced Collapse on Send Screen

Summary: Related to T2772. Moved multi-recipients switch out of the Advanced collapse.

Test Plan:
cd web/cashtab && npm start
navigate to send screen
observe that the multiple recipients switch sits above the Address form input
use the switch
observe that the switch's functionality is otherwise unchanged

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D12520