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remove NULLDUMMY

Description

remove NULLDUMMY

Summary:
Now that the Schnorr multisig upgrade is active, the NULLDUMMY standard
flag is totally superseded and pointless.

Test Plan:

make check
test_runner.py

run IBD

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: Mengerian

Maniphest Tasks: T653

Differential Revision: https://reviews.bitcoinabc.org/D4577