Fix: Replace inheritance call with decorator delegation

Author: dabico

src/main/java/ch/usi/si/seart/treesitter/OffsetTreeCursor.java

@@ -144,7 +144,7 @@ public Node getDescendant(int startByte, int endByte) {
 
         @Override
         public Node getDescendant(@NotNull Point startPoint, @NotNull Point endPoint) {
-            return super.getDescendant(
+            return node.getDescendant(
                     startPoint.subtract(offset),
                     endPoint.subtract(offset)
             );
@@ -182,7 +182,7 @@ public Node getNamedDescendant(int startByte, int endByte) {
 
         @Override
         public Node getNamedDescendant(@NotNull Point startPoint, @NotNull Point endPoint) {
-            return super.getNamedDescendant(
+            return node.getNamedDescendant(
                     startPoint.subtract(offset),
                     endPoint.subtract(offset)
             );