Minor fix in computation of OKS

[shrivaths16]

Description

There was an error in computing the value of the oks where there was an unnecessary factor of 2 in computing the spread factor on line 206 and I have removed it.

Types of changes

• [x] Bugfix

Does this address any currently open issues?

• 1346

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

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[codecov[bot]]

Codecov Report

Merging #1383 (eee68af) into develop (8c6bdb4) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1383   +/-   ##
========================================
  Coverage    72.64%   72.64%           
========================================
  Files          133      133           
  Lines        23695    23695           
========================================
  Hits         17214    17214           
  Misses        6481     6481           

Impacted Files	Coverage Δ
sleap/nn/evals.py	70.25% <100.00%> (ø)

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