The number form of setTTLExpiration keeps the daily default cleanup scan #3372

Table.setTTLExpiration(seconds) (the number form) sets the expiration but keeps whatever cleanup scan cadence the table already had, which for a table whose TTL was never declared through the object form is the daily default (cleanupInterval starts at 86400000 in makeTable). The object form derives the cadence from (expiration + eviction) / 4. So a table configured only through the number form expires records on read but reclaims them once a day. This is main's existing behavior, surfaced while reviewing harper-pro#436 step 1, which keeps it unchanged.

Review-Deferral: 4402531b64a9d499 severity=minor category=correctness

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Review-Deferral: bd5a93255e400188 severity=minor category=correctness