Commented setSequenceNr() in sort out

src/main/java/de/thm/arsnova/services/QuestionService.java

@@ -111,11 +111,11 @@ public class QuestionService implements IQuestionService, ApplicationEventPublis
         // if SortIndex false, list is sorted so new question is appended to sorted list with (highest sequenceNr)++
         if ("lecture".equals(question.getQuestionVariant())) {
             if(session.getSortLectureQuestions()) {
-                question.setSequenceNr();
+                //question.setSequenceNr();
             }
         } else if ("preparation".equals(question.getQuestionVariant())) {
             if(session.getSortPreparationQuestions()) {
-                question.setSequenceNr();
+                //question.setSequenceNr();
             }
         }