core/state/pruner: fix state bloom sync permission in Windows #23370
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After writing the bloom filter for the offline pruner, we opened the file read-only and synced it to disk. This ensures that the OS flushes all it's internal buffers before we start deleting data.
Whilst on Linux calling
fsyncon a read-only file works, it does not on Windows. This PR opens the file in read-write mode to work around this quirk.Fixes #23364.