clang-tidy: Fix modernize-use-default-member-init in CScriptCheck
Summary:
This concludes backport of core#26749
https://github.com/bitcoin/bitcoin/pull/26749/commits/a87fb6bee5a7fb0879b3adea9a29997f1331acb0
Depends on D16147
Test Plan: ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D16148