test(overlay): use static queries w/ overlay containers

[jelbourn]

No description provided.

[crisbeto]

Maybe we should put in detectChanges calls instead? My guess here is that the first test used static queries and then we ended up copying it everywhere.

[jelbourn]

I decided to use static for this one since it keeps the test as running just one change detection, even though it's largely trivial.

[crisbeto]

LGTM

[ngbot]

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