Fix lowercase db or schema in connection string

[Sielnix]

Description

There's a bug, that having specified database or schema name in connection string, that contains any lowercase letter, throws exception during connection opening.

This PR fixes that.

Checklist

• [x] Code compiles correctly
• [x] Code is formatted according to Coding Conventions
• [ ] Created tests which fail without the change (if possible)
• [ ] All tests passing (dotnet test)
• [ ] Extended the README / documentation, if necessary
• [ ] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[github-actions[bot]]

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[Sielnix]

I have read the CLA Document and I hereby sign the CLA