Fix dispute key on dispute module for consistency

[Spablob]

Dispute module
/// @notice Gets the protocol-wide module identifier for this module
/// @return The dispute module key
function name() public pure override returns (string memory) {
    return DISPUTE_MODULE_KEY;
}

Royalty Module
string public constant override name = ROYALTY_MODULE_KEY;

Licensing Module
string public constant override name = LICENSING_MODULE_KEY;