lib/db, lib/model: Always use reasonable sized batches (fixes #2250, fixes #4112)

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Harmonize how we use batches in the model, using ProtoSize() to judge
the actual weight of the entire batch instead of estimating. Use smaller
batches in the block map - I think we might have though that batch.Len()
in the leveldb was the batch size in bytes, but it's actually number of
operations.

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4114

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