Calculate the relative position of the floating toolbars by calling
the ImplCallMove function, where the current position is read from
the real window.

Change-Id: I6a142055c3340dda2339980fbc5a7ebb431e228b
Reviewed-on: https://gerrit.libreoffice.org/64093
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>