There were some VclPtrs hiding inside std::vector (twice), so fix
that, but the destructor is still not called (getting Window::~Window
inconsistency assert). With this patch however the screenshot cppunit
test no longer fails

Thanks noelgrandin for help

Change-Id: I8b46c4608cbab2070e36ef4abec226bcd997425e
Reviewed-on: https://gerrit.libreoffice.org/26772Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>