update teacher code

EduSystemServer/teacher/models.py

@@ -3,4 +3,5 @@ from django.db import models
 
 # Create your models here.
 class Teacher(models.Model):
-    tid = models.AutoField(primary_key=True, verbose_name="教师编号")
+    tid = models.AutoField(primary_key=True, verbose_name="教师编号")
+