When generating OutputType don't cast to Type[]

[SeeminglyScience]

This fixes an issue with constrained language mode where modules that specify multiple OutputType's as System.Type would throw due to Type[] not being a "core type".

An example of a command shipped with Windows that would previously throw is Get-DeliveryOptimizationStatus from the DeliveryOptimization module.

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[daxian-dbw]

LGTM

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