[Button Toggle] Initial value of [0] does not work when values are indicies

[andrewseguin]

https://stackblitz.com/edit/angular-ulbznt?file=app/button-toggle-exclusive-example.html

In the example, the first option should be selected.

[tinayuangao]

The problem is when using [value], the value is set before the list of MatButtonToggles available to the button toggle group. Using [ngModel] will make it work.

This is a bug we should fix.

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