[Cashtab] [p2] Patch fee falc in sendToken

Summary:
T2644

Depends on D11924

Patch ambiguous comment with BCH artifact

Test Plan: Confirm no other instances of bch in the sendToken function

Reviewers: #bitcoin_abc, kieran709

Reviewed By: #bitcoin_abc, kieran709

Subscribers: kieran709

Differential Revision: https://reviews.bitcoinabc.org/D11925