Update MonoAlphabeticTest.java

Author: riti2601

src/test/java/com/thealgorithms/ciphers/MonoAlphabeticTest.java

@@ -3,7 +3,6 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.util.stream.Stream;
-
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;