[ecash-herald] CashFusion with no space

Summary:
Depends on D14723

Change appearance of Cash Fusion txs from 'Cash Fusion' with space to 'CashFusion'

Test Plan: npm test

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D14724