Fixed Mutation error-state with errorPolicy:all

[LowieHuyghe]

With errorPolicy:all Mutation should call the correct callbacks and set the correct state.

Fix for #2253: errorPolicy: all in defaultOptions causes error to be undefined

[apollo-cla]

@LowieHuyghe: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Meteor Contributor Agreement here: https://contribute.meteor.com/

[amacleay]

I would love to see this change get in - figuring out this issue has been a huge pain and I believe your change will fix it @LowieHuyghe !

Let me know if there's anything I can do to help!

[hwillson]

Thanks very much for working on this @LowieHuyghe! We're going to go with the slightly different approach outlined in #2374, but your contributions here helped form that PR. ❤️