Make line color consitent between CategoryListBox and simple ListBox

Line color is changed in CategoryListBox::UserDraw() method so we
need to explicitely specify it here too.

Change-Id: Ia3dcbf70e0a53cfba16d5d2df0fc2e4d7e23ad71
Reviewed-on: https://gerrit.libreoffice.org/47083Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>

vcl/source/control/imp_listbox.cxx

@@ -1699,6 +1699,7 @@ void ImplListBoxWindow::ImplPaint(vcl::RenderContext& rRenderContext, sal_Int32
     {
         rRenderContext.SetTextColor(!IsEnabled() ? rStyleSettings.GetDisableColor() : rStyleSettings.GetHighlightTextColor());
         rRenderContext.SetFillColor(rStyleSettings.GetHighlightColor());
+        rRenderContext.SetLineColor();
         rRenderContext.DrawRect(aRect);
     }
     else