Access2Base - Bug when event triggered by toolbar button

cfr. Change 9452 on master

Argument given by LO to macro triggered by toolbar button is an integer, not an object.
This should not cause a visible error for the end-user from within the Events() Sub

Change-Id: I4a307270b0d5cf2992b3bb304deb8cd30222dd95
Reviewed-on: https://gerrit.libreoffice.org/9452
Reviewed-by: Lionel Elie Mamane <lionel@mamane.lu>
Tested-by: Lionel Elie Mamane <lionel@mamane.lu>
(cherry picked from commit 4916efd5c69684f12fa062f734345627291b49e4)
Reviewed-on: https://gerrit.libreoffice.org/9540
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>