plasmoid: disable unused scrollbar
The connection list has the ScrollBar at its default AsNeed policy, but the content is resizing so that a horizontal scrollbar is never needed. This is not only some extra unnecessary work, but also causes a binding loop when the popup is closed.
Instead, just mark the horizontal ScrollBar as AlwaysOff and avoid the extra work and binding loop.
print-manager version of plasma-nm!424 (merged)