Always add the keyboard shortcut to the toolbar tooltips

Change-Id: I6f6e385cf6d09b0a3f18b708daeff2df9aba83c6
Reviewed-on: https://gerrit.libreoffice.org/11595
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>