Revert "Don't re-retrieve sit part in SP.HandleAgentSit() when we already have it."

This reverts commit 2c00b73cd2.

Wrong code change

OpenSim/Region/ClientStack/Linden/Caps/Tests/WebFetchInvDescModuleTests.cs

@@ -117,9 +117,7 @@ namespace OpenSim.Region.ClientStack.Linden.Caps.Tests
             PollServiceEventArgs pseArgs;
             userCaps.TryGetPollHandler("FetchInventoryDescendents2", out pseArgs);
             req.UriPath = pseArgs.Url;
-            Console.WriteLine("req.UriPath:{0}", req.UriPath);
             req.Uri = new Uri(req.UriPath);
-            Console.WriteLine("req.Uri:{0}", req.Uri);
 
             // Retrieve root folder details directly so that we can request
             InventoryFolderBase folder = scene.InventoryService.GetRootFolder(ua.PrincipalID);