Update Default vacancyStatus Course.java

src/main/java/id/ac/ui/cs/advprog/tutorial0/model/Course.java

@@ -7,5 +7,5 @@ import lombok.Setter;
 public class Course {
     private String courseId;
     private String courseName;
-    private boolean vacancyStatus;
+    private boolean vacancyStatus = true;
 }