Updates issue of 0 value for query_result_dists in search_memory

[asharani97]

• [x] Does this PR have a descriptive title that could go in our release notes?
• [ ] Does this PR add any new dependencies?
• [ ] Does this PR modify any existing APIs?
  • [ ] Is the change to the API backwards compatible?
• [ ] Should this result in any changes to our documentation, either updating existing docs or adding new ones?

Reference Issues/PRs

What does this implement/fix? Briefly explain your changes.

This passes query_result_dists in search() for DiskANN without any filters

Any other comments?

No