fix优惠券发放平台学生

cooleshow-user/user-biz/src/main/resources/config/mybatis/SysUserMapper.xml

@@ -64,7 +64,7 @@
                 )
             </if>
             <if test="client.code == 'STUDENT'">
-                AND t.tenant_id_ == -1
+                AND t.tenant_id_ = -1
             </if>
         </where>