[Cashtab] Upgrade slpv1 burn txs

Summary: Use latest coinselect and slpv1 methods to create and broadcast slpv1 token burn txs in Cashtab

Test Plan: npm test

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15534