修改《课程--学生列表--添加分班：当输入组名为9个汉字时，如图，当前分班显示与搜索框显示不合适》bug

Signed-off-by: alan <547533434@qq.com>

app/views/courses/_member_list.html.erb

@@ -2,8 +2,8 @@
 <% if User.current.logged? && User.current.member_of_course?(@course) && @group  %>
       <% if !@canShowCode %>
           <%= join_in_course_group(@course.course_groups,@group, User.current) %>
-      <% end %>&nbsp;&nbsp;&nbsp;
+      <% end %>
-    <span style="font-size: 18px; float: left; margin-right: 35px">
+    <span style="font-size: 12px; float: left; margin-right: 5px">
       <%= l(:label_current_group)%>:&nbsp;
       <%= @group.name %>
     </span>