[backport] test: Fix AreInputsStandard test to reference the proper scriptPubKey

Summary:
f95989b3ed Fix AreInputsStandard test to reference the proper scriptPubKey (Ben Woosley)

Pull request description:

This value doesn't affect the outcome of the test, because the values are
properly set on line 351 (https://github.com/bitcoin/bitcoin/pull/13565/files#diff-b7061098b41bd31ef5db043705441133R351), but this makes the test values internally coherent.

This is a backport of Core PR13565

Test Plan:

ninja check
ninja check-functional

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, nakihito, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, nakihito, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D5699