emit activate-row in vcl treeview on return

to align it with the gtk one which does this

Change-Id: Id439fe684f263f59285ba9291fc803f88309c066
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/94875
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/source/treelist/svimpbox.cxx b/vcl/source/treelist/svimpbox.cxx
index b2d4b0dc..2fc2d0b 100644
--- a/vcl/source/treelist/svimpbox.cxx
+++ b/vcl/source/treelist/svimpbox.cxx
@@ -2368,8 +2368,7 @@ bool SvImpLBox::KeyInput( const KeyEvent& rKEvt)
            break;

        case KEY_RETURN:
            if (m_pView->mbActivateOnSingleClick)
                m_pView->DoubleClickHdl();
            m_pView->DoubleClickHdl();
            bKeyUsed = false;
            break;