Change places of distance and margin input boxes (note: ids were set
correctly, they were merely labelled incorrectly).
Also moved the object in the .ui file to make it easier to read.

Change-Id: I180d7afdf9dfb483f5dbfcf7ba68c73900499807
Reviewed-on: https://gerrit.libreoffice.org/70303
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>