Fix supportedVideoFormat out of index exception in demo

[georgezy-amzn]

ℹ️ Description

Fix the a demo crash on simulator due to out of index exception.

Issue #, if available

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update
  • [ ] README update
  • [ ] CHANGELOG update
  • [ ] guides update
• [ ] This change requires a dependency update
  • [ ] Amazon Chime SDK Media
  • [ ] Other (update corresponding legal documents)

🧪 How Has This Been Tested?

• Manually tested locally by starting a meeting

Additional Manual Test

• [X] Pause and resume remote video
• [X] Switch local camera
• [X] Rotate screen back and forth

📱 Screenshots, if available

provide screenshots/video record if there's a UI change in demo app

✅ Checklist

Integration validation (required before release)

• [ ] Unit tests pass
• [ ] Build SDK against simulator with release options
• [ ] Build SDK against device with release options
• [ ] Build SDK against simulator with debug options
• [ ] Build SDK against device with debug options
• [ ] Test Demo against simulator with SDK (debug build) in workspace
• [ ] Test Demo against device with SDK (debug build) in workspace
• [ ] Test DemoObjC against simulator with SDK (debug build) in workspace
• [ ] Test DemoObjC against device with SDK (debug build) in workspace
• [ ] Test Demo against simulator with SDK.framework (release build)
• [ ] Test Demo against device with SDK.framework (release build)
• [ ] Test DemoObjC against simulator with SDK.framework (release build)
• [ ] Test DemoObjC against device with SDK.framework (release build)

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