Remove -magneticanomalyactivationtime from functional tests

Summary:
The tests that checked for magnetic activation are removed, the others
are updated.

Test Plan:

./test/functional/test_runner.py abc-magnetic-anomaly-mining

abc-replay-protection abc-transaction-ordering

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: teamcity, schancel

Differential Revision: https://reviews.bitcoinabc.org/D2324