getBezirk: fix referencing jssafe in wrong class

#495 (closed)

What does this MR do?

• A refactoring went wrong and left references to jsSafe method in Func which did not exist anymore. Correct these

How confident are you it won't break things if deployed?

Links to related issues

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• joined #foodsharing-beta channel at https://slackin.yunity.org
• added an entry to CHANGELOG.md (description, merge request link, username(s))