[CMAKE] Run wallet tests as part of the check-bitcoin target

Summary:
The wallet tests were build with the test_bitcoin executable but have
been forgotten as part of the check-bitcoin target.

Test Plan:

ninja check-bitcoin

Ensure the wallet tests are run.

cmake -GNinja .. -DBUILD_BITCOIN_WALLET=OFF
ninja check-bitcoin

Ensure the tests are run, but no wallet test.

Reviewers: #bitcoin_abc, deadalnix, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Subscribers: jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D5008