Remove empty widget container, lot of garbage placeholders and
redundant adjustment.

Regression from commit fba28df7
Oh dear, how could I possibly have reviewed this in?

Change-Id: I25af642afad094faba5b0ba1e37cfbf1a954e52f
Reviewed-on: https://gerrit.libreoffice.org/47720Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>