GHSA-VC34-39Q2-M6Q3 nimiq-account: Vesting insufficient funds error can panic

Impact VestingContract::canchangebalance returns AccountError::InsufficientFunds when newbalance balance, the node crashes while trying to return an error. The mincap balance precondition is attacker-reachable because the vesting contract creation data 32-byte format allows encoding totalamount...