Slot waits: a cancelled or unwritten re-ask loses the slot the thread held #114

From the final check of #110 (#110 (comment)), minor, no new round.

If a thread that already holds a slot asks again and that re-ask is cancelled, or its write fails between the grant and applyGrants, the hold it had was already moved to the new ask, so the thread loses its slot. This is the safe side (a slot is freed, never doubled), but the thread loses a slot it had.

Possible fix: keep the old hold until applyGrants has written the new one.

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