Remove references to CreateWalletFromFile

Summary:
CWallet::CreateWalletFromFile() was removed in D10228 but these references remain.

This is a backport of core#20285

Test Plan:
grep -r CreateWalletFromFile

With TSAN:
ninja check check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10724