fix(android): tabs inside modal throw error on close #8879
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PR Checklist
What is the current behavior?
When closing a modal with back button (or tapping outside), things that depend on Fragments (like Tabs) will throw an error because the fragment was already disposed.
What is the new behavior?
Unloaded is called first, giving a chance for the components to clean up before modal close.
Might be worth it to wait for e2e testing to work again before merge.
Fixes NativeScript/nativescript-angular#2259.