[Cashtab] Fix reply button not showing

Summary: Related to T2712. Fixed issue with reply button not showing up, default behavior is now to show reply button on any OPReturnMsg tx.

Test Plan:
cd web/cashtab && npm start
Ensure there are msg txs in recent TxHistory
Observe that the reply button is present on all msg txs
Navigate to settings page
Turn on hideMessagesFromUnknownSenders
navigate back to Home
Observe that the reply button is present on all msg txs.

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D12166