Use default implementation of init for step handler.

src/main/java/org/orekit/rugged/api/RuggedBuilder.java

@@ -743,11 +743,6 @@ public class RuggedBuilder {
                     new ArrayList<TimeStampedAngularCoordinates>();
             propagator.setMasterMode(interpolationStep, new OrekitFixedStepHandler() {
 
-                /** {@inheritDoc} */
-                @Override
-                public void init(final SpacecraftState s0, final AbsoluteDate t) {
-                }
-
                 /** {@inheritDoc} */
                 @Override
                 public void handleStep(final SpacecraftState currentState, final boolean isLast)