Check for lifetime uses in closures as well

The `BodyLifetimeChecker` which checks for the use of any non-anonymous
non-static lifetime did not recurse into closures, missing lifetime
uses. This would lead to a bogus elision suggestion.

The `BodyLifetimeChecker` is not refined enough to avoid false
positives, as any conforming lifetime, including one coming from the outer
context, would be considered a hit. The number of false positives might
increase now that we check closures as well, in case those closures
define and use lifetimes themselves.

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