bean: use a non-varargs call for a stopOOoConnection method invocation

Change-Id: I589436be7d28b50b0b900a314b300d382eac5eb8
Reviewed-on: https://gerrit.libreoffice.org/11445
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>