[CI] Run the functional tests when wallet is disable

Summary: This is possible since D5184, so ensure it doesn't get broken.

Test Plan:

export ABC_BUILD_NAME=build-without-wallet
../contrib/teamcity/build-configurations.sh

Reviewers: #bitcoin_abc, deadalnix, nakihito

Reviewed By: #bitcoin_abc, deadalnix, nakihito

Differential Revision: https://reviews.bitcoinabc.org/D5279