Remove data carrier size activation.

Summary: With the increase happening today, it is not necessary to gate the size icnrease anymore.

Test Plan:

make check
./test/functional/test_runner.py --extended

Reviewers: #bitcoin_abc, schancel

Reviewed By: #bitcoin_abc, schancel

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1419