Remove unnecessary fuse

[pronebird]

Hi,

I am not entirely sure but I think this fuse() is unnecessary given that None is being handled in the loop. Let's see if CI can compile that.

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This change is 

[MarkusPettersson98]

The select! macro we're using requires the future to implement FusedFuture, which futures::channel::mpsc::UnboundedReceiver does not do. We invoke fuse() to get a Fuse<UnboundedReceiver>, which does implement FusedFuture.

• https://docs.rs/futures/latest/futures/macro.select.html
• https://docs.rs/futures/latest/futures/future/trait.FusedFuture.html#impl-FusedFuture-for-Fuse%3CFut%3E

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