设置第一个模式出现黑屏。设置最好模式

Log: 双屏显示自定义设置时出现黑屏、图标消失
Bug: https://pms.uniontech.com/zentao/bug-view-48348.html
Change-Id: I5bef9c39630b2b3c181c73f007af12bd4fed8b25
Reviewed-on: http://gerrit.uniontech.com/c/dde-control-center/+/5758
Tested-by: <mailman@uniontech.com>
Reviewed-by: lizhongming <lizhongming@uniontech.com>
Reviewed-by: <mailman@uniontech.com>