wipe_draft!: add a grace period to the lock-with-no-draft branch

Its other two branches both require a day's inactivity before
touching anything; this one didn't, so a lock acquired seconds ago
with nothing drafted yet looked identical to one abandoned for a
week -- confirmed with a throwaway script showing a lock cleared
inside a single method call. Guarded on autosave.nil? specifically,
since the method's first line already guarantees any autosave
reaching this branch is a day old by construction.

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