Take into consideration not determined status into checking notifications access status

[piotrtorczynski]

✏️ Description

let config = IterableConfig()
config.autoPushRegistration = false
IterableAPI.initialize(apiKey: apiKey, launchOptions: launchOptions, config: config)

If you take into consideration that the user has autoPushRegistration set to false, the SDK will return notificationsEnabled set to true due to this bug. If autoPushRegistration is set to false, the user often has UNAuthorizationStatus set to .notDetermined.

This change fixes this issue so that by default SDK should return the proper value

[sumeruchat]

That makes sense. Thanks for the PR.