BUG #13799. Fix vtkSMProxyProperty::UpdateAllInputs().

Bring back missed vtkSMProxyProperty::UpdateAllInputs(). This was lost in
transition to the collaborative ServerManager.

Change-Id: If54ba19b0f615674245639b77c175554a9474d49
Merge topic '13779_fix_update_all_inputs' into next

8586b70 BUG #13799. Fix vtkSMProxyProperty::UpdateAllInputs().