Remove redundant equals method for singleton DummyNeighbor class

Author: robinmaisch

languages/java-cpg/src/main/java/de/jplag/java_cpg/transformation/operations/DummyNeighbor.java

@@ -6,8 +6,6 @@
 import java.util.List;
 import java.util.Map;
 
-import org.jetbrains.annotations.Nullable;
-
 import de.fraunhofer.aisec.cpg.graph.Node;
 import de.fraunhofer.aisec.cpg.graph.edge.PropertyEdge;
 
@@ -49,7 +47,7 @@ public void saveOriginalTarget(PropertyEdge<Node> edge) {
         if (edge.getEnd().equals(this)) {
             return;
         }
-        targetMap.computeIfAbsent(edge.getEnd(), n -> new ArrayList<>()).add(edge);
+        targetMap.computeIfAbsent(edge.getEnd(), _ -> new ArrayList<>()).add(edge);
     }
 
     /**
@@ -60,7 +58,7 @@ public void saveOriginalSource(PropertyEdge<Node> edge) {
         if (edge.getStart().equals(this)) {
             return;
         }
-        sourceMap.computeIfAbsent(edge.getStart(), n -> new ArrayList<>()).add(edge);
+        sourceMap.computeIfAbsent(edge.getStart(), _ -> new ArrayList<>()).add(edge);
     }
 
     /**
@@ -100,8 +98,4 @@ public void clear() {
         sourceMap.clear();
     }
 
-    @Override
-    public boolean equals(@Nullable Object other) {
-        return other == INSTANCE;
-    }
 }