CDVNotification.m: Fix pointer casting in sound completion callback

[GitToTheHub]

• Corrects casting of callback data to ensure proper handling of integer values when passing and retrieving the beep count in AudioServicesAddSystemSoundCompletion and soundCompletionCallback.
• Produced the warning: Cast to smaller integer type 'int' from 'void *'

Platforms affected

Motivation and Context

Description

Testing

Checklist

• [ ] I've run the tests to see all new and existing tests pass
• [ ] I added automated test coverage as appropriate for this change
• [ ] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [ ] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [ ] I've updated the documentation if necessary