Cleanup a Notice message: align the prototype of DBDeleteSingleObject to the current one.

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@4326 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-config-mgmt/datamodel.itop-config-mgmt.xml

@@ -552,7 +552,7 @@
           <static>false</static>
           <access>public</access>
           <type>Overload-DBObject</type>
-          <code><![CDATA[  	public function DBDeleteSingleObject(&$oDeletionPlan)
+          <code><![CDATA[  	public function DBDeleteSingleObject()
 	{
 		if (MetaModel::GetConfig()->Get('demo_mode'))
 		{