[Cashtab] [chronik tx history p9] Correctly calculate etoken amount for genesis txs
Summary:
T2447
Depends on D12089
Correctly calculate minted amount for eToken genesis txs
Note: still need to correct these amounts for etoken decimals, will happen in another part of this stack
Test Plan:
Review unit test and npm test
Mint an eToken and confirm the eTokenAmount field is correct (although it is not adjusted for decimal places)
Reviewers: #bitcoin_abc, emack
Reviewed By: #bitcoin_abc, emack
Differential Revision: https://reviews.bitcoinabc.org/D12129