I think you can initialize $scope.addlist.nego =true; and keep the $scope.addlist.negoin ng-changeto see if the value change. Main thing is initializing first.
Where are you saving? Can you show how it is called? If you need it for to save it you can store it in localstorage and call value from localstorage in every initialize.
Figured it out, i have $scope inside my controller, just now i am initializing the toggle in the $scope not above the scope, now move it to before the scope and its work.