test: Run feature_bip68_sequence.py with MiniWallet
Summary:
This PR enables one more of the non-wallet functional tests (feature_bip68_sequence.py) to be run even when no wallet is compiled in by using the MiniWallet instead
Completes backport of core#26657.
Test Plan:
./test/functional/test_runner.py feature_bip68_sequence
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Subscribers: PiRK
Differential Revision: https://reviews.bitcoinabc.org/D16485