feat: fix test case

Author: sailok.chinta

src/test/java/com/thealgorithms/datastructures/trees/QuadTreeTest.java

@@ -47,7 +47,7 @@ public void testQueryInQuadTree() {
         quadTree.insert(new Point(100, 100));
 
         List<Point> points = quadTree.query(new BoundingBox(new Point(0, 0), 100));
-        Assertions.assertEquals(4, points.size());
+        Assertions.assertEquals(8, points.size());
 
         points = quadTree.query(new BoundingBox(new Point(5, 5), 5));
         Assertions.assertEquals(1, points.size());