fdo#80538 Add (hidden) edit icons to the toolbar again

per https://bugs.freedesktop.org/show_bug.cgi?id=80538#c23

Change-Id: I1e9b06bd84ddbfbf70b4de904679bb99c2b72da0
Reviewed-on: https://gerrit.libreoffice.org/11203
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>