[tg bot] remove extra line break from tg msgs

Summary:
T2972

Depends on D13284

Remove extra line break. We don't want 2 line breaks after this, only one.

Test Plan: npm run msgs and note absence of extra line break after etoken txs

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D13285