fix(remote-config): type error in callback for modular onConfigUpdated

[bennettp123]

Description

Update the type for the modular onConfigUpdated callback to match the existing type in the namespaced export

Related issues

Fixes #8613

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

before:

after:

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 15, 2025 0:52am

[CLAassistant]

All committers have signed the CLA.

[MichaelVerdon]

Thank you for this, looks good to me.