Remove SCRIPT_VERIFY_CHECKDATASIG_SIGOPS flag from Schnorr test
Remove SCRIPT_VERIFY_CHECKDATASIG_SIGOPS flag from Schnorr test

Summary: It's not necessary, so remove it.

Test Plan: make check

Reviewers: markblundeberg, #bitcoin_abc, deadalnix

Reviewed By: markblundeberg, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3144

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