minor: Add back commented out logging message in Caps.RegisterHandler() that I accidentally removed.

OpenSim/Capabilities/Caps.cs

@@ -143,6 +143,7 @@ namespace OpenSim.Framework.Capabilities
         /// <param name="handler"></param>
         public void RegisterHandler(string capName, IRequestHandler handler)
         {
+            //m_log.DebugFormat("[CAPS]: Registering handler for \"{0}\": path {1}", capName, handler.Path);
             m_capsHandlers[capName] = handler;
         }