T30411-Fix_wrong_label_color_display_after_instance_addition

Summary: Fixed T30411

Test Plan: code review, ui test (error is fixed; see T30411)

Reviewers: O1 MITK Reviewer Group I, kislinsk

Reviewed By: O1 MITK Reviewer Group I, kislinsk

Subscribers: kislinsk

Maniphest Tasks: T30411

Differential Revision: https://phabricator.mitk.org/D940