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Mask Immutables in Local Verify Task (#691)

Fixes #689

The local verification task does not work correctly for contracts with
`immutable`s. This is because, `immutable` values get written when the
contract's init code executes on-chain, but uses `0` place holders in
the `deployedBytecode` compiler output.

This causes the code that is fetched from the deployed contract to
differ slightly from the compiler's byte code output (fetched code has
non-0 `immutable` values, while the compiler output has 0 `immutable`
values).

The fix is to mask the `immutable`s from the fetched code with 0's
before comparing.

With this fix, `local-verify` script now works for the
`SimulateTxAccessor` contract:

```
$ npx hardhat local-verify --network localhost
Verification status for CompatibilityFallbackHandler: SUCCESS
Verification status for CreateCall: SUCCESS
Verification status for MultiSend: SUCCESS
Verification status for MultiSendCallOnly: SUCCESS
Verification status for Safe: SUCCESS
Verification status for SafeL2: SUCCESS
Verification status for SafeProxyFactory: SUCCESS
Verification status for SignMessageLib: SUCCESS
Verification status for SimulateTxAccessor: SUCCESS
Verification status for TokenCallbackHandler: SUCCESS
```

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