Music resumes when route loss occurs during phone call

Number:rdar://FB7721110 Date Originated:6/1/2020
Status:Open Resolved:
Product:AVFoundation Product Version:iOS *
Classification:Bug Reproducible:Always
Steps to reproduce:
1. With AirPods paired, play music on you iPhone
2. Accept incoming call on your iPhone
3. Turn off bluetooth or d/c the AirPods any way you want
4. Observe/Expected phone call continues via phone speakers
5. End the phone call

Observe: Music resumes, playing out of phone speakers
Expected: Music should not resume (Due to route loss)

- beginInterruption fired correctly
- routeLoss notification fired correctly 
- didEndInterruption fired with `shouldResume: true` - should probably be false


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