[HREMD] Fix storing wrongly indexed coords to checkpoint

[SimonBoothroyd]

Description

HREMD now correctly stores coordinates as coords[i] = replica_i_coords rather than coords[i] = state_i_coords. Checkpoints from previous versions will likely be incorrect.

Status

• Ready to go

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.56%. Comparing base (02d7967) to head (2a97846).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files          46       46           
  Lines        3092     3092           
=======================================
  Hits         2955     2955           
  Misses        137      137           

Flag	Coverage Δ
unittests	95.56% <100.00%> (ø)

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