Prevent page double release #3684
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Fixes #3682
There is a bug in a corner case of MVMap.remove(), when B-tree height is reduced and existing (saved) page pops up as a new tree root. Subsequent immediate commit() and store closure would fail to recognize root update negating result of the removal, but not the release of previous root page, as not used any more. Later this manifest itself as double release of that page.