fix(material/list): selection list option selected value reset if form control is initialized to empty value

[crisbeto]

Fixes the selected value of a mat-list-option that is set through an input being reset if a FormControl is assigned to the list with a default empty value.

[jelbourn]

It looks like there's still an issue where the form control value is out of sync with the selected options after initialization

[jelbourn]

To clarify, the individual options initialize before the @ContentChildren(MatListOption) options is initialized. The selected setter tells the list that it should update its value, but the _reportValueChange doesn't update the form model because those options are still undefined at that point.

We should probably add a subscription on the options query list that initializes the form state from the options if it hasn't been initialized already.

[crisbeto]

@jelbourn isn't that what we're doing here in ngAfterContentInit?

[jelbourn]

I mean that the SelectionModel does have the correct values from the selected property on the options.

[crisbeto]

Closing since this is quite out of date and we haven't gotten any bug reports about it as far as I can see.

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