unnecessary duplicate SetImage

Change-Id: Ie337eeae3c8295c4d7e62401f438c50d5bfc9693
Reviewed-on: https://gerrit.libreoffice.org/54159
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/window/layout.cxx

@@ -2355,7 +2355,6 @@ MessageDialog::MessageDialog(vcl::Window* pParent,
             break;
         case VclMessageType::Question:
             SetText(GetStandardQueryBoxText());
-            m_pImage->SetImage(GetStandardQueryBoxImage());
             break;
         case VclMessageType::Error:
             SetText(GetStandardErrorBoxText());