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Rename `requiredPrefund` to `missingAccountFunds` (#124)

This PR applies a minor suggestion resulting from the audit where the
`validateUserOp` parameter names (specifically for the required account
fund transfer to the entrypoint) did not exactly match the name from the
ERC.

Note that the test entrypoint was slightly adjusted to more closely
model the behaviour of the [reference
entrypoint](https://github.com/eth-infinitism/account-abstraction/blob/94cf025ef/contracts/core/EntryPoint.sol#L421-L427),
where left-over user balances are considered when computing the
`missingAccountFunds` to pass into the `validateUserOp` call:

```solidity
            uint256 missingAccountFunds = 0;
            if (paymaster == address(0)) {
                uint256 bal = balanceOf(sender);
                missingAccountFunds = bal > requiredPrefund
                    ? 0
                    : requiredPrefund - bal;
            }
```

I noticed this while looking for instances of `requiredPrefund` in the
codebase. All tests continue to pass 🎉.

Another minor change, I noticed that `prettier .` was not picking up
`.sol` files anymore, so I adjusted the NPM scripts to explicitly format
and check them.

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