Revert cached "available" amount if the AddFunds message send fails #4273
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Problem
In the FundMgr's
EnsureAvailable
, if the MpoolPush call fails, we have the incorrect value cached in our local map of available funds for a given address, causing subsequent calls to possibly fail.Solution
In the case of errors after we have updated the cached values, revert the value.
Resolves #4149