[url_launcher] Update for UIScene compatibility (#10549) Replaces the code that attempted to find the topmost presented view controller as the context for presenting a Safari view controller with a call to the new registrar API to get the Flutter view's controller. Since it's now possible for there not to be a view controller, adds an exception for that case. This should only be possible in an add-to-app scenario where someone tries to show an in-app URL from a Flutter view that is not being displayed, which is an unlikely enough scenario that I'm not going to consider this a breaking change. Fixes https://github.com/flutter/flutter/issues/174415 ## Pre-Review Checklist [^1]: Regular contributors who have demonstrated familiarity with the repository guidelines only need to comment if the PR is not auto-exempted by repo tooling.
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