Reduce roku scan interval by 5s

[ctalkington]

Breaking change

Proposed change

I've been semi-cautious about the scan interval because i didn't want to over-poll and cause issues for older devices.

I last reduced this value by 10s several releases ago, iirc. If this causes an issue, in the next release, we may be able to adapt the scan interval based on device or implement a backoff of sorts.

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[frenck]

Thanks, @ctalkington 👍