test: use OP_TRUE p2sh address in p2p_permissions

Summary: In D9906 I used a regular p2pkh address-key pair to avoid using a script. But the script is more convenient and faster (one less signature). This will be used in coming backports.

Test Plan: test/functional/test_runner.py p2p_permissions

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10247