* contracts-bedrock: fixes `OptimismMintableERC721Factory` test

This contract is only used as a predeploy so it should be tested based
on the L2 genesis generation setup. Ensures that the address is stored
and labeled as part of in memory test setup, as well as updates the
tests to work based on the predeploy.

This is a small refactor to make future Standard L2 genesis work more
simple.

Also includes a small ABI fix to the `OptimismMintableERC721Factory`
since this contract has not been updated to decouple immutable naming
conventions from its ABI.

* snapshots: update

* checks: fix

* lint: fix

* typo: fix