Update LiveDataTestUtil.kt

[al-zy-naf]

I think we should use catch instead of finally because finally is always executed.

Imagine when the LiveData value was set, the Observer.onChanged() method is triggered and removing the observer on [email protected](this). So when we using finally, the Observer which we deleted earlier will be removed again which would be wasting.

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[al-zy-naf]

@googlebot I signed it!