[backport#15886] Do not show list for the only recipient.

Summary:
https://github.com/bitcoin/bitcoin/pull/15886/commits/78f9b5160fea32f85c6ced16b3b0cccda6d3b181

Depends on D7290

Concludes backport of Core PR15886

Test Plan:

ninja

send coins with bitcoin-qt -regtest and check there's no more detailed option for single recipient

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7291