[V117-specific; Store migration] SubFunds ETH.ETH dust from the two remaining Yggdrasil vaults
[V117-specific]
Intended to close #1592 (closed)
'The last two Yggdrasil vaults have unreturned ETH.ETH dust and are unresponsive (offline/Standby; no messages since before the hard fork)'.
(This explicitly deducts up to the observed balances,
rather than zeroing arbitrarily large values.)
Format modification requests are welcome.