Fix errant newline in make_chainparams
Summary: The extra newline in the terminal doesn't really matter, but it gives a bad smell when stdout is redirected to a file.
Test Plan:
Before patch:
$ ./make_chainparams.py 0000000000000000030e63e8b8a3e08e25244daf633203c416c91f5b03968641 000000000000000000000000000000000000000000ff5be32693c1c823f2aac5
After patch:
$ ./make_chainparams.py 0000000000000000030e63e8b8a3e08e25244daf633203c416c91f5b03968641 000000000000000000000000000000000000000000ff5be32693c1c823f2aac5
Reviewers: #bitcoin_abc, deadalnix, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D4140