fix: 切换用户异常

[waterlovemelon]

原因：没有正常获取到session文件中的DISPLAY字段，导致切换用户失败。根因应该是systemd创建session文件的时候缺少了字段。 解决方案：从user文件中获取DISPLAY数据，如果在session中没有找到DISPLAY的，则使用user的DISPLAY。 可以使用DisplayManager服务提供的切换用户接口，有待测试。

Log: 解决切换用户异常的情况 Bug: https://pms.uniontech.com/bug-view-155487.html Influence: Change-Id: I8d61e81dcb7cac7ef16c4a0a0d289494bdbf98fd

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