Make CreateClaimTest compatible with DataModel 1.0

The original error that caused the confusion here is resolved with
https://github.com/wmde/WikibaseDataModel/pull/169

Should we still merge this? I'm not sure. What do you think?

Change-Id: I86dfb285430dcb930a2b8bdb2e4f51fb4baa051c
Merge "Make CreateClaimTest compatible with DataModel 1.0"