fdo#81933 do not select 1st slide unconditionally

This is a regression from commit
ad0c4bf5790546242884da0c2ec281f2db9e14a0 . But I do not see why this
code would be needed for that either.

Change-Id: Ied3a5d25b2bec9542aa83c4d7fa36ed5313fc797
(cherry picked from commit 904fdac93b072cc5295cce0360f47926f049e6ea)
Reviewed-on: https://gerrit.libreoffice.org/10869
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
fdo#81995: fix Outline numbering tab page

The "ParentNumbering" property is not a string.

(regression from 97eb8a6e0eb830f37dcba64a51d725aab4c5ff53)

Change-Id: Ib33e95847b388bb1126a63812e128c96a0c00730
(cherry picked from commit 4d3c9ed257e51af55f358d2b44d5fc2e341c7202)
Reviewed-on: https://gerrit.libreoffice.org/10874
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Eike Rathke <erack@redhat.com>