Fix Tutorial playground for removal of `ArrayOf<>`
Fix Tutorial playground for removal of `ArrayOf<>`

This case was changed from `ArrayOf<Int>` to `[Int]`, but the corresponding `getArray` stuck around.

From #264, on this line https://github.com/CodaFi/SwiftCheck/commit/b6b4bc61dc0a41889040a38ebe8f5926ae713d2c#diff-47970fd31917fb63ccf81bd68065f0abR343
CodaFi/SwiftCheck,CodaFi/SwiftCheck,CodaFi/SwiftCheck,typelift/SwiftCheck,typelift/SwiftCheck,CodaFi/SwiftCheck,typelift/SwiftCheck,typelift/SwiftCheck,typelift/SwiftCheck,CodaFi/SwiftCheck