Revert "End demo meeting faster when video service unavailable (#636)"

[ziyiz-amzn]

This reverts commit 4750a80.

ℹ️ Description

revert the change because the workaround is not needed and a fix has been completed on media backend.

Issue #, if available

Type of change

• 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?

describe the tests that you ran to verify your changes, any relevant details for your test configuration

Unit test coverage

• Class coverage:
• Line coverage:

Additional Manual Test

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

📱 Screenshots, if available

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

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