[cashtab] Move finalized indicator

Summary:
Proposed ui edit to make the avalanche finalized indicator a bit more subtle.
Its good info for sure, but not critical to most users and I was finding the blue check mark/spinner was taking up some prime space and attention.

Test Plan: npm start and try sending a transaction, observe finilizing state, and check the check mark

Reviewers: #bitcoin_abc, bytesofman

Reviewed By: #bitcoin_abc, bytesofman

Subscribers: bytesofman

Differential Revision: https://reviews.bitcoinabc.org/D17984