Remove redundant import from PowerOfFourTest

Author: krishna-medapati

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

@@ -3,7 +3,6 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import com.thealgorithms.maths.PowerOfFour;
 import org.junit.jupiter.api.Test;
 
 class PowerOfFourTest {