fix(recording): remove drift detection that overrides explicit sink choice

Validation Check 2 (default sink drifted) would silently replace the
user's explicit sink selection from quick-setup with the default sink's
monitor on every recording start. Removed it — if the device still
exists, trust the user's choice. The no-audio warning (Check 3) already
catches wrong-sink scenarios.

Also fix commentary: device selection does not persist across sessions
(both vars are plain defvar), and update validation section to match
the two remaining checks.

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