We always want the lattice energy in eV

[T-Nicholls]

Corresponding change for DiamondLightSource/pytac#144, so tests will fail until that is merged

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.73%. Comparing base (18acf16) to head (85714f1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   89.28%   86.73%   -2.56%     
==========================================
  Files           6        6              
  Lines         392      392              
==========================================
- Hits          350      340      -10     
- Misses         42       52      +10     

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[ptsOSL]

I have tested these changes and now:

• All ATIP tests pass
• The virtac launches in I04 okay