replaced atoms.coordinates() with atoms.positions in benchmarks

[aditi2906]

Fixes #3638

Changes made in this Pull Request:

• replaced atoms.coordinates() with atoms.positions in benchmarks

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[codecov]

Codecov Report

Merging #3668 (6207749) into develop (b53bce0) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #3668      +/-   ##
===========================================
- Coverage    94.31%   94.28%   -0.04%     
===========================================
  Files          191      191              
  Lines        24894    24894              
  Branches      3355     3355              
===========================================
- Hits         23480    23471       -9     
- Misses        1365     1374       +9     
  Partials        49       49              

Impacted Files	Coverage Δ
package/MDAnalysis/due.py	46.66% <0.00%> (-30.00%)	⬇️

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