- Fix Datetime rounding in RLMConvertBsonToRLMBSON

[anton-plebanovich]

I noticed that the Date types returned from Sync Functions calls are rounded to seconds. This PR fixes the issue. Please note that I am not a C++ programmer so this probably could be done in a better way. I will gladly accept any fix requests with hints.

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[anton-plebanovich]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!