[cashtab] Mobile style fixes

Summary: Fixing some display issues on smaller screens on the transaction rows

Test Plan:
Preview the site and check transactions, especially token info and messages, look good on small screens

after

before

Things to note:
Losing the tx icon and token image/icon at very small screens to allow other content to fit nicer
margins and padding tightened up

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: alitayin, bytesofman, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D18001