Fix registration payment object migration values

Sébastiaan Versteeg requested to merge fix/payment-obj into master

Previous behaviour

Steps to reproduce:

  1. Migrate events
  2. Notes in payments like Event registration Event object (417). Registration: Registration object (8887)

New behaviour

Steps to validate that it works:

  1. Migrate events
  2. Notes in payments like Event registration Bowling 2019-02-16 18:00. Registration: Registration object (8887)

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