[Cashtab] [Alias] Emoji parsing edge case

Summary: As per T2977, this aligns the getAliasAndAddresses logic in chronik.js to the Alias Spec by accepting registration txs that have paid more than the designated fee for their alias' bytecount.

Test Plan:

• npm test
• enable alias feature in ticker.js
• attempt to register 🤔 and ensure alias taken error is displayed
• attempt to register an unregistered emoji and ensure it is successfully registered, including sending to it via Send.js

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D13252