fix: reset stage when scanner is cancelled - #362
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Stage.Auditee and Stage.EnableRemoteVerify only reset to Stage.None inside the RESULT_OK branch of the scanner's ActivityResultLauncher callback. Backing out of the camera activity (RESULT_CANCELED) left stage stuck at Auditee/EnableRemoteVerify with no content generated yet. A later configuration change then hid the buttons in onCreate's onPreDraw listener without restoring any content, leaving only the toolbar visible. Fixes GrapheneOS#323
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Reset attestation UI stage when the user backs out of the camera scanner without RESULT_OK.
Fixes #323
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