fix(ngModel): use `$evalAsync` for blur events to safely `$apply`

Set the `$touched` asynchronously using `$evalAsync` if the element is blurred during an `$apply`, otherwise it keeps the old behaviour.

Fixes https://github.com/angular/angular.js/issues/8762
You should check `$rootScope.$phase`, like here https://github.com/angular/angular.js/blob/master/src/ng/directive/ngEventDirs.js#L62