Fix compatibility with UISceneDelegate #50
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Fixes #49
This approach to accessing the root view controller was adapted from the share_plus plugin:
https://github.com/fluttercommunity/plus_plugins/blob/bc6fafc8936f5734e2d1581fb7d7694547e70bfe/packages/share_plus/share_plus/ios/share_plus/Sources/share_plus/FPPSharePlusPlugin.m#L10-L27
I did check that it is compatible with pre-UISceneDelegate scenarios.