Disable wallet and address book Qt tests on macOS minimal platform

Summary:

macOS Qt minimal platform is frequently broken, and these are currently
failing with Qt 5.11.1.

The tests do pass when run on the full cocoa platform
(with `test_bitcoin-qt -platform cocoa`).

Backport of core PR14011
https://github.com/bitcoin/bitcoin/pull/14011/files

This was improperly backported in D2054.
Expected to fix issue #340:
https://github.com/Bitcoin-ABC/bitcoin-abc/issues/340

Test Plan:
On OSX with minimal platform (default):

make check

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D3936