Write LJ parameters with 5 decimal places instead of 3 with MCF writer.

[rwsmith7531]

PR Summary:

This PR increases the number of decimal places for LJ parameters from 3 to 5 in the Cassandra MCF writer. See #1093 .

Closes #1093 .

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (3d64ab4) 89.37% compared to head (fb393dc) 89.37%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1095   +/-   ##
=======================================
  Coverage   89.37%   89.37%           
=======================================
  Files          61       61           
  Lines        6164     6164           
=======================================
  Hits         5509     5509           
  Misses        655      655           

Impacted Files	Coverage Δ
mbuild/formats/cassandramcf.py	85.08% <ø> (ø)

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[daico007]

LGTM!