ekf2_test: test validity of local position when not at rest

At rest, the zero velocity update keeps the local position valid all the
time. Deactivate it to be able to test the validity checks

src/modules/ekf2/test/test_EKF_fusionLogic.cpp

@@ -66,6 +66,10 @@ public:
 		_ekf->set_vehicle_at_rest(true);
 
 		_sensor_simulator.runSeconds(7);
+
+		// When at rest, the strong zero velocity update keeps the local position
+		// valid. Deactivate this to test the change of validity without zvup
+		_ekf->set_vehicle_at_rest(false);
 	}
 
 	// Use this method to clean up any memory, network etc. after each test