make example use index view

[sam-herman]

Description

I noticed in the SiftSmall examples that when we demo persisting and loading back from disk we are still using the original flat vectors accessor which seem a bit counter intuitive since we are expecting OnDiskGraphIndex to already have the node vector values included.
https://github.com/jbellis/jvector/blob/main/jvector-examples/src/main/java/io/github/jbellis/jvector/example/SiftSmall.java#L163

Proposed Solution

So in the example line above, should we switch this line: (using raav )

            Function<VectorFloat<?>, SearchScoreProvider> sspFactory = q -> SearchScoreProvider.exact(q, VectorSimilarityFunction.EUCLIDEAN, ravv);

To this (using the index view index.getView()):

            Function<VectorFloat<?>, SearchScoreProvider> sspFactory = q -> SearchScoreProvider.exact(q, VectorSimilarityFunction.EUCLIDEAN, index.getView());

[jbellis]

lgtm, thanks!