Correct anchor detection in QML components.

Summary: The loop to translate the anchor shape position in TextDocumentImpl was mis-written, always testing shape's parent, instead of parent's parent. This was creating an infinite loop in case an email address was present in a table for instance.

Reviewers: leinir, pvuorela, danders, boemann

Reviewed By: leinir, pvuorela

Subscribers: Calligra-Devel-list, #calligra:_3.0

Tags: #calligra:_3.0

Differential Revision: https://phabricator.kde.org/D23492