fix: Use the correct constant for the iOS version number (M2-8843)

[sultanofcardio]

📝 Description

🔗 Jira Ticket M2-8443

This PR fixes the iOS version being sent to the backend from the mobile app in the OS-Version http header.

📸 Screenshots

Pay attention to the os_version column

Before (Optional)	After

🪤 Peer Testing

1. Build and run the mobile app on an iOS device, and log in
2. Check the user_device_events_history table in the database and look for rows with ios as the os_name
3. Confirm that the os_version is the correct version of iOS running on the device, and not the string iOS

✏️ Notes

N/A

[farmerpaul]

I still can't submit answers to my localhost BE (did you ever solve that?), so I just added a console.log to confirm the correct header is being sent.

[sultanofcardio]

@farmerpaul you can get around the answer submission issue by commenting out this line on the BE. But you don't need to submit answers to check this ticket, only log in (or swipe refresh), then check the db table for the record