fix: lost RxDocument in preSave from v14.0.0

[scriptsman]

This PR contains:

• A BUGFIX

Describe the problem you have without this PR

// series
myCollection.preSave(function(plainData, rxDocument){
    // rxDocument is always undefined in the latest version
    console.log(rxDocument)
    // modify anyField before saving
    plainData.anyField = 'anyValue';
}, false);

https://rxdb.info/middleware.html

Todos

• Tests

[pubkey]

Thank you for the fix. We also need a test to ensure this does not break.

[scriptsman]

Thank you for the fix. We also need a test to ensure this does not break.

Done. And I think we should pass the argument in the type of RxDocumentData instead of RxDocument.

[scriptsman]

@pubkey Is there anything else I have to check? And when can this PR be merged? I need to fix this issue as soon as possible.