后端修改题库管理中，填空题每保存一次，空后面就会多一个#，每有2个#，再保存时，#就会变成答题区域的下划线的bug

cqb-question-resource/src/main/java/com/qmth/cqb/question/service/impl/QuesServiceImpl.java

@@ -171,7 +171,7 @@ public class QuesServiceImpl implements QuesService{
     }
 
     private void updateQuesBody(Question question) {
-    	String newQuesBody = question.getQuesBody().replaceAll("___", "##");
+    	String newQuesBody = question.getQuesBody().replaceAll("______", "###");
         question.setQuesBody(newQuesBody);
 	}