Reproduce DOMAIN_SEPARATOR if chainId is changed

[coveralls]

Pull Request Test Coverage Report for Build 1146818574

• 0 of 38 (0.0%) changed or added relevant lines in 8 files are covered.
• 5 unchanged lines in 5 files lost coverage.
• Overall coverage remained the same at 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
contracts/NFT1155V0.sol	0	1	0.0%
contracts/NFT721V0.sol	0	1	0.0%
contracts/ERC1155ExchangeV0.sol	0	5	0.0%
contracts/ERC721ExchangeV0.sol	0	5	0.0%
contracts/SocialTokenV0.sol	0	5	0.0%
contracts/base/BaseNFT1155.sol	0	6	0.0%
contracts/base/BaseNFT721.sol	0	7	0.0%
contracts/TokenFactory.sol	0	8	0.0%
<!--	Total:	0	38	0.0%	-->

Files with Coverage Reduction	New Missed Lines	%
contracts/base/BaseNFT1155.sol	1	0%
contracts/base/BaseNFT721.sol	1	0%
contracts/ERC1155ExchangeV0.sol	1	0%
contracts/ERC721ExchangeV0.sol	1	0%
contracts/SocialTokenV0.sol	1	0%
<!--	Total:	5		-->

Totals
Change from base Build 1146758967:	0.0%
Covered Lines:	0
Relevant Lines:	784

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💛 - Coveralls