remove now unused individual LandData prim counts.

However, the calls to the land management module to record prims need to remain, since they were also being used to return owner object lists, etc.
This is probably why prim counts were being done there in the first place.

OpenSim/Framework/ILandChannel.cs

@@ -77,7 +77,6 @@ namespace OpenSim.Region.Framework.Interfaces
         /// </param>
         void Clear(bool setupDefaultParcel);
         
-        bool IsLandPrimCountTainted();
         bool IsForcefulBansAllowed();
         void UpdateLandObject(int localID, LandData data);
         void ReturnObjectsInParcel(int localID, uint returnType, UUID[] agentIDs, UUID[] taskIDs, IClientAPI remoteClient);