[UWS] Fix bug with the configuration of the destruction controller.

The configuration of the DestructionTimeController was never effective
in the UWSServlet with a configuration file: the wrong instance was set.

src/uws/service/UWSServlet.java

@@ -1067,7 +1067,7 @@ public abstract class UWSServlet extends HttpServlet implements UWS, UWSFactory
 		DestructionTimeController destructionController;
 		if (controller == null || !(controller instanceof DestructionTimeController)){
 			destructionController = new DestructionTimeController();
-			inputParamControllers.put(UWSJob.PARAM_DESTRUCTION_TIME, controller);
+			inputParamControllers.put(UWSJob.PARAM_DESTRUCTION_TIME, destructionController);
 		}else
 			destructionController = (DestructionTimeController)controller;