[Casthab] Remove classNames from Tx.js

Summary: Replaced components with classnames with styled-components, removed unecessary 'antd-collapse' className. Related to T2445.

Test Plan:
cd web/cashtab && npm start
Ensure there is at least one received eCash tx, eToken tx and genesis tx.
check that the Tx amount for each is the appropriate color

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D11526