svtools: fix -Werror=unused-parameter

Change-Id: Ic8887571e376483e84d7c2eb270d3daaa37c63f3
diff --git a/svtools/source/uitest/uiobject.cxx b/svtools/source/uitest/uiobject.cxx
index 494406a..8af13ff 100644
--- a/svtools/source/uitest/uiobject.cxx
+++ b/svtools/source/uitest/uiobject.cxx
@@ -95,7 +95,7 @@ StringMap TreeListEntryUIObject::get_state()
    return aMap;
}

void TreeListEntryUIObject::execute(const OUString& rAction, const StringMap& rParameters)
void TreeListEntryUIObject::execute(const OUString& rAction, const StringMap& /*rParameters*/)
{
    if (rAction == "COLLAPSE")
    {