AppDefinition memory validation is not consistent between UI and backend

[janisz]

Occurrences in code:

• Backend:
  • src/main/scala/mesosphere/marathon/state/AppDefinition.scala:552
  • docs/docs/rest-api/public/api/v2/schema/AppDefinition.json:379
• Forntend:
  • src/js/constants/AppFormErrorMessages.js:54
  • src/js/stores/validators/AppFormValidators.js:150

It's minor issue and looks like easy fix but what is correct value 0 or 32?

[janisz]

Duplicates #3933