add missing consoleAppender.setWithJansi(true) call

Signed-off-by: Ceki Gulcu <ceki@qos.ch>

Author: ceki

Diff for: logback-classic/src/test/java/ch/qos/logback/classic/issue/logback_1759/Logback1759Test.java

@@ -24,7 +24,6 @@
 import ch.qos.logback.core.util.StatusPrinter2;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.slf4j.spi.MDCAdapter;
 
 public class Logback1759Test {
 
@@ -68,6 +67,7 @@ public void smoke() {
         consoleAppender.stop();
 
         init();
+        consoleAppender.setWithJansi(true);
         consoleAppender.start();
 
         consoleAppender.doAppend(le);