fdo#73151 Always open Styles&Formatting dialog in the sidebar

This removes the floating window for Styles&Formatting as discussed in fdo#73151.

Change-Id: I352d27a4d30632dcfda8963c23629e62ab850524
Reviewed-on: https://gerrit.libreoffice.org/11253
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>