Recovery Interact Fixes

[abhayks1]

PR covers few fixes while integration with recovery:

• primaryType mismatch fix.

• As per EIP712 domainSeparator, signing domain for address should be

  bytes32 public constant DOMAIN_SEPARATOR_TYPEHASH = keccak256(
        "EIP712Domain(address  verifyingContract)"
    );

Gnosis also follows same domain signing field name:
https://github.com/gnosis/safe-contracts/blob/development/contracts/GnosisSafe.sol

keccak256(
       "EIP712Domain(address verifyingContract)"
   );

• However for recovery DOMAIN_SEPARATOR_TYPEHASH is below:

bytes32 public constant DOMAIN_SEPARATOR_TYPEHASH = keccak256(
        "EIP712Domain(address delayedRecoveryModule)"
    );

[benjaminbollen]

LGTM; for hotfix; openst-contracts DelayedRecoveryModule must be updated to correctly follow EIP712