[Cashtab] Use user modal confirmation settings for minting tokens

Summary:
T3709

Currently there is no confirmation on mint txs.

imo Mint is not the kind of action that always needs a confirmation (like burn). So, defer to user settings on this.

Test Plan: npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D17383