Update RNPermissionHandlerLocationWhenInUse.m

[joonmanji]

Summary

updating to not use deprecated methods.

Test Plan

What's required for testing (prerequisites)?

What are the steps to test it (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅
Android	✅

Checklist

• [x] I have tested this on a device and a simulator
• [x] I added the documentation in README.md
• [x] I added a sample use of the API in the example project (example/App.tsx)

[zoontek]

This remove iOS 13 support + _locationManager might not be instantiated when you are using it.