LM: minor cleanup

Author: karussell

core/src/main/java/com/graphhopper/routing/lm/LMApproximator.java

@@ -212,13 +212,6 @@ public double getSlack() {
         return lms.getFactor();
     }
 
-    /**
-     * This method forces a lazy recalculation of the active landmark set e.g. necessary after the 'to' node changed.
-     */
-    public void triggerActiveLandmarkRecalculation() {
-        recalculateActiveLandmarks = true;
-    }
-
     @Override
     public String toString() {
         return "landmarks";