[Customer Center] `presentCustomerCenter()` does not work inside react-navigation modal

[rrebase]

• [x] I have updated Purchases SDK to the latest version
• [x] I have read the Contribution Guidelines
• [x] I have searched the Community
• [x] I have read docs.revenuecat.com
• [x] I have searched for existing Github issues

1. Environment
   1. Platform: iOS
   2. SDK version:
      • "react-native-purchases": "8.7.0"
      • "react-native-purchases-ui": "8.7.0"
   3. React Native version: 0.76
   4. Related deps
      • "@react-navigation/native": "7.0.14"
      • "@react-navigation/native-stack": "7.2.0"
      • "react-native-screens": "4.4.0"
2. Steps to reproduce, with a description of expected vs. actual behavior

Try to open customer center from a modal screen via RevenueCatUI.presentCustomerCenter()

Expected: Customer Center opens Actual: Nothing happens

Works as expected on non-modal screens.