[Cashtab] [Address simplification p1/4] Stopconverting to BCH formats for Send Token

Summary:
T2730

Part 1 of a stacked diff to remove unnecessary address conversions

In this diff, we stop converting destination token addresses to simpleledger: format, and stop converting the output address to legacy format.

Both of these steps are artifacts relating to previous use of bch-js, which required these formats in creating transactions.

Test Plan:
npm start
Send an etoken tx to an etoken address

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D12651