fix: Reset navigation state correctly in KF reverse pass (#2368)

We use a different abort mechanism in the KF and do not need to tell the navigator about the target surface

Pulled this out of #2336 where it fixed a bug

Core/include/Acts/TrackFitting/KalmanFitter.hpp

@@ -535,10 +535,12 @@ class KalmanFitter {
       result.passedAgainSurfaces.push_back(&st.referenceSurface());
 
       // Reset navigation state
+      // We do not need to specify a target here since this will be handled
+      // separately in the KF actor
       navigator.resetState(
           state.navigation, state.geoContext, stepper.position(state.stepping),
           state.options.direction * stepper.direction(state.stepping),
-          &st.referenceSurface(), targetSurface);
+          &st.referenceSurface(), nullptr);
 
       // Update material effects for last measurement state in reversed
       // direction