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Check for Double Initialization (#436)

The test/example Safe signer launchpad pattern in the ERC-4337 module
directory did not contain an important security check preventing double
initialization which could lead to an account being taken over.

In order to better document the security requirements for such a
contract, we added the double initialization check to the pre-validation
setup.

Huge kudos to Ackee Blockchain for bringing this to our attention
:muscle:.

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