refactor: simplify logic of Point::equals in KDTree (#5158)

src/main/java/com/thealgorithms/datastructures/trees/KDTree.java

@@ -75,7 +75,6 @@ public class KDTree {
         @Override
         public boolean equals(Object obj) {
             if (obj instanceof Point other) {
-                if (other.getDimension() != this.getDimension()) return false;
                 return Arrays.equals(other.coordinates, this.coordinates);
             }
             return false;