[Bug]: Badge not working in iOS with "Increase by" option

[devsideal]

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What happened?

Badge not working in iOS with "Increase by" option, alwasy showing only 1 count.

https://github.com/OneSignal/OneSignal-Flutter-SDK/assets/91250232/432e9410-bee2-447d-a193-aff73214150b

Steps to reproduce?

1. Added package successfully
2. Followed all the steps given here https://documentation.onesignal.com/docs/badges
3. Send push from OneSignal console by setting 1 in "Increase by" option
4. In iPhone alwasy showing count 1 (for reference please see the video)

What did you expect to happen?

If we send push with Increase by 1, It should add in previous count.

OneSignal Flutter SDK version

onesignal_flutter: ^3.5.1

Which platform(s) are affected?

• [X] iOS
• [ ] Android

Relevant log output

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct