Override AutoContinue if moving back from mouth

[amalnanavati]

This PR overrides auto-continue if the robot arrived at DetectingFace through the MoveFromMouth state. This is to avoid the case where the user mistakenly presses back, and then it automatically moves to their mouth.

• Check auto-continue, go to detecting face, verify that it continues.
• From BiteDone, go back to staging config, verify it doesn't auto-continue.
• Pause MoveToMouth and go back, verify it doesn't auto-continue.

This PR also adds better error handling to the WebRTC server.

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