style: remove unused import from PowerOfTwoOrNotTest.java

Author: vil02

src/test/java/com/thealgorithms/maths/PowerOfTwoOrNotTest.java

@@ -3,7 +3,6 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import java.util.Map;
 import org.junit.jupiter.api.Test;
 
 public class PowerOfTwoOrNotTest {