Merge #12468: Add missing newline in init.cpp log message

Summary:
PR12468 backport https://github.com/bitcoin/bitcoin/pull/12468/files
8b661f971 fixes #12465 added missing terminating newline character in log message (Josh Hartshorn)

Pull request description:

Adding missing new line as detailed in #12465

Test Plan:
make check

• manually ran with pruning on testnet then re-ran with checkblocks=500; confirm that logs look better now

Reviewers: jasonbcox, Fabien, #bitcoin_abc, deadalnix

Reviewed By: jasonbcox, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3110