fetch physical_prim switch from [Startup] config from inside scene, as is done for most other scene config params

OpenSim/Framework/ConfigSettings.cs

@@ -35,12 +35,9 @@ namespace OpenSim.Framework
         public string StorageDll                    { get; set; }
         public string ClientstackDll                { get; set; }
 
-        /// <summary>
-        /// Controls whether physics can be applied to prims.  Even if false, prims still have entries in a
-        /// PhysicsScene in order to perform collision detection
-        /// </summary>
+
         public bool   PhysicalPrim                  { get; set; }
-        
+
         public string LibrariesXMLFile              { get; set; }
 
         public const uint DefaultRegionHttpPort = 9000;