Updated Open dex contracts

[praveen-kaia]

Proposed changes

• Fixed open-dex-contract issues

Types of changes

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• Bugfix
• New feature or Enhancement
• Others

Checklist

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• I have read the CONTRIBUTING GUIDELINES doc
• I have signed the CLA by posting "I have read the CLA Document and I hereby sign the CLA" in the comment
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules