[wallet] Remove fromAccount argument from CommitTransaction()

Summary:
Partial backport of Core PR13825
https://github.com/bitcoin/bitcoin/pull/13825/commits/0bb1b4e229a869769d81d1531435393a25fcf29

Depends on D5316

Test Plan:

ninja check
test_runner.py wallet_*

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5420