[Cashtab] Do not show ALP and SLP options for NFT mints

Summary: Only SLP NFTs are supported, so do not show this switch for minting NFTs.

Test Plan:
npm test, see before and after screenshots

before

after

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D17240