Remove direct bitcoin calls from qt/utilitydialog.cpp

Summary:
Partial backport for Core PR 10244
https://github.com/bitcoin/bitcoin/pull/10244/commits/c2f672fb1960399389dea9cdd8f76d7156c2c88b
Progress towards T417
Depends on D2815, D2826

Test Plan:

make check
ninja check
bitcoin-qt # sanity checking
bitcoin-qt -help
bitcoin-qt -version

Reviewers: deadalnix, Fabien, #bitcoin_abc

Reviewed By: deadalnix, Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D2816