drop WB_SIMPLEMODE for TreeView

multi selections are weird with this set

Change-Id: I765c46294803d06911a6ac3fc37d68dd001aacdc
Reviewed-on: https://gerrit.libreoffice.org/64192
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/source/window/builder.cxx b/vcl/source/window/builder.cxx
index 3b04e1f..c76abc3 100644
--- a/vcl/source/window/builder.cxx
+++ b/vcl/source/window/builder.cxx
@@ -1904,7 +1904,7 @@ VclPtr<vcl::Window> VclBuilder::makeObject(vcl::Window *pParent, const OString &
        //   everything over to SvHeaderTabListBox/SvTabListBox
        //c) remove the users of makeSvTabListBox and makeSvTreeListBox
        extractModel(id, rMap);
        WinBits nWinStyle = WB_CLIPCHILDREN|WB_LEFT|WB_VCENTER|WB_3DLOOK|WB_SIMPLEMODE;
        WinBits nWinStyle = WB_CLIPCHILDREN|WB_LEFT|WB_VCENTER|WB_3DLOOK;
        if (m_bLegacy)
        {
            OUString sBorder = BuilderUtils::extractCustomProperty(rMap);
@@ -1917,7 +1917,7 @@ VclPtr<vcl::Window> VclBuilder::makeObject(vcl::Window *pParent, const OString &
            nWinStyle |= WB_BORDER;
        if (m_bLegacy)
        {
            xWindow = VclPtr<ListBox>::Create(pRealParent, nWinStyle);
            xWindow = VclPtr<ListBox>::Create(pRealParent, nWinStyle | WB_SIMPLEMODE);
            xWindowForPackingProps = xWindow;
        }
        else