[Cashtab] Deprecate BCH param from getChangeAddressFromInputUtxos function
Summary:
T2730
Depends on D12663
Remove BCH param from getChangeAddressFromInputUtxos function. The param is not used in this function and exists there as an artifact.
Test Plan: npm test
Reviewers: #bitcoin_abc, emack
Reviewed By: #bitcoin_abc, emack
Differential Revision: https://reviews.bitcoinabc.org/D12664