野指针再次销毁。删除注销

Log: 点击通用模块，控制中心闪退
Bug: https://pms.uniontech.com/zentao/bug-view-49012.html
Change-Id: I7f76701bd87dddc2542f3f57a1b2a79fbdbd9abe
Reviewed-on: http://gerrit.uniontech.com/c/dde-control-center/+/5931
Reviewed-by: fanpengcheng <fanpengcheng@uniontech.com>
Reviewed-by: <mailman@uniontech.com>
Tested-by: <mailman@uniontech.com>