[fixes #6979] Fix input not normalising to ObjectId for certain query operators

[Rua-Yuki]

This PR fixes balderdashy/sails#6979.

All tests appear to be passing locally. Further, these changes don't appear to have caused any problems with our large app/test suites.

I'd like to have tests added to validate this behaviour and prevent any sort of regression; would balderdashy/waterline-adapter-tests be the correct place to have this done, or should we create only adapter-specific tests here?

[sailsbot]

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