Fix SNMP tests compilation issue on Windows

Christophe Sovant

19.53.2008 8a2e109ceb3c6f6053b845d43ce74f284b8766ca

 opends/tests/shared/functions/topology.xml

@@ -638,7 +638,7 @@
      </call>
      
      <!-- fixMe: Windows Services are not enabled -->
      <if expr="isWindows">
      <if expr="is_windows_platform(dsHost)">
        <script>
          enableWindowsService=''
        </script>