Revert "Show a dialog if bluetooth key is missing when reconnecting"

Revert submission 28985385-bt_key_missing_dialog

Reason for revert: Likely culprit for b/362901443  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:28985385-bt_key_missing_dialog

Change-Id: I2a3ab8f0dbd2c81eda49d11abc6d586f59f149e9