This was introduced when adjusting the selection behaivour.

When we change to the selection tool we might delete items.
This item could be in itemlist we forward to AbstractFormEditorTool.

Therefore we change to the selection tool after calling
mouseReleaseEvent().

Change-Id: I5cab902b8560780c6ee4edc3466e7087d719f1ef
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>