test: Add missing LIBBITCOIN_ZMQ to test_test_bitcoin_LDADD

Summary:
Partial backport of core PR15504 (commit fab2daa):
https://github.com/bitcoin/bitcoin/pull/15504/commits/fab2daa026494cdacda530f1253eb43cf0f1576c

Test Plan:

make check

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D4630