Fix UnownedVariableCaptureRuleTests in Swift 5.2

[marcelofabri]

https://bugs.swift.org/browse/SR-12168

[SwiftLintBot]

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⚠️	Please include a CHANGELOG entry to credit yourself! You can find it at CHANGELOG.md.

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* Fix UnownedVariableCaptureRuleTests in Swift 5.2.  
  [marcelofabri](https://github.com/marcelofabri)
  [#issue_number](https://github.com/realm/SwiftLint/issues/issue_number)

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