Set filter to send proper rotations for root part

This allows the root prim, alone or in a set, to send it's
	rotation. This fixes unsitting the avatar on sit-offsest
	type teleports where the sit target is in the root prim of
	a linkset.

OpenSim/Region/Framework/Scenes/SceneObjectPart.cs

@@ -2099,7 +2099,7 @@ namespace OpenSim.Region.Framework.Scenes
         {
             Quaternion newRot;
 
-            if (this.LinkNum == 0)
+            if (this.LinkNum == 0 || this.LinkNum == 1)
             {
                 newRot = RotationOffset;
             }