Activate cashaddr by default
Activate cashaddr by default

Summary: The activation code is not necessary anymore as the date is well in the past.

Test Plan:
  make check
  test/functional/test_runner.py

Reviewers: #bitcoin_abc, markblundeberg

Reviewed By: #bitcoin_abc, markblundeberg

Differential Revision: https://reviews.bitcoinabc.org/D3538

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