Resolve groups for owner

Group owner does not necessary (= by default) have the core.view_group permission, but should be able to view his groups anyway.

This is needed for courses_of_teacher to return the groups of the course as well.

requested review from @pinguin

assigned to @permcu

added 1 commit

• 78bc5ba1 - Reformat

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approved this merge request

removed review request for @pinguin

assigned to @hansegucker and unassigned @permcu

merged

mentioned in commit 4347deb7