More consistently dispose of SqliteCommand in OpenSim.Data.SQLite where possible.

Not doing SQLiteInventoryStore since this is no longer used and should disappear in the future.

OpenSim/Data/SQLite/SQLiteFramework.cs

@@ -90,12 +90,5 @@ namespace OpenSim.Data.SQLite
                 return cmd.ExecuteReader();
             }
         }
-
-        protected void CloseCommand(SqliteCommand cmd)
-        {
-            cmd.Connection.Close();
-            cmd.Connection.Dispose();
-            cmd.Dispose();
-        }
     }
-}
+}