Revert "OP_REVERSEBYTES activation logic"

Summary:
This reverts commit fcf22e8fcc94ebd7554bf4345608f86cdf54b7fb.

This is breaking the nowallet build and @tobias_ruck do not seem to be reachable

Test Plan: Build without wallet and run the integration test suite.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: tobias_ruck

Differential Revision: https://reviews.bitcoinabc.org/D5278