Resolve Promise to YES for Linking.openURL (#24955)
Resolve Promise to YES for Linking.openURL (#24955)

Summary:
The `Linking.openURL()` method is supposed to resolve to a `true` `Promise` when the URL was properly open. However, in iOS, the `Promise` was resolving to `nil`. So I fixed this issue by making it resolve to `YES` (`true`), just like on Android.

## Changelog

[iOS] [Fixed] - Fix return value of `Linking.openURL()`
Pull Request resolved: https://github.com/facebook/react-native/pull/24955

Differential Revision: D15411994

Pulled By: cpojer

fbshipit-source-id: 90bdd6cfae8d69d7a239a0b4c84d75859e293b32

hammerandchisel/react-native,facebook/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,hammerandchisel/react-native,arthuralee/react-native,janicduplessis/react-native,javache/react-native,hammerandchisel/react-native,hammerandchisel/react-native,exponent/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,hammerandchisel/react-native,hoangpham95/react-native,exponentjs/react-native,exponentjs/react-native,janicduplessis/react-native,exponentjs/react-native,arthuralee/react-native,hoangpham95/react-native,pandiaraj44/react-native,facebook/react-native,hoangpham95/react-native,facebook/react-native,exponentjs/react-native,facebook/react-native,janicduplessis/react-native,hoangpham95/react-native,myntra/react-native,janicduplessis/react-native,exponentjs/react-native,myntra/react-native,myntra/react-native,arthuralee/react-native,hammerandchisel/react-native,hammerandchisel/react-native,myntra/react-native,exponent/react-native,hoangpham95/react-native,facebook/react-native,facebook/react-native,myntra/react-native,myntra/react-native,javache/react-native,janicduplessis/react-native,exponentjs/react-native,exponentjs/react-native,exponent/react-native,hoangpham95/react-native,hoangpham95/react-native,pandiaraj44/react-native,exponent/react-native,hoangpham95/react-native,exponentjs/react-native,javache/react-native,arthuralee/react-native,hammerandchisel/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,exponent/react-native,exponent/react-native,arthuralee/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,exponent/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,javache/react-native,pandiaraj44/react-native,exponent/react-native,javache/react-native