ekf2: apply yaw reset to vision attitude error filter

- set vision attitude error filter uninitialized if vision data stops
 - ev error filter is only compiled when ev config is selected

Co-authored-by: bresch <brescianimathieu@gmail.com>

src/modules/ekf2/EKF/ev_control.cpp

@@ -81,6 +81,8 @@ void Ekf::controlExternalVisionFusion()
 		stopEvYawFusion();
 		stopEvHgtFusion();
 
+		_ev_q_error_initialized = false;
+
 		_warning_events.flags.vision_data_stopped = true;
 		ECL_WARN("vision data stopped");
 	}