Monocular `New session same camera` flow on web app mobile can change camera

[carmichaelong]

On monocular workflow, using iPhone 17 as the camera and Pixel 7 to drive web app:

1. Start a new session from main page. Choose subject. Go to session page. Can record trials using Pixel 7.
2. Choose New session same camera
3. Choose subject. Go to session page.
4. Issue: Can no longer collect trials on Pixel 7. Web app directs user to recording from mobile app.