fix(abacus): Compatibility with kspacing set to 3 values

[pxlxingliang]

No description provided.

[codecov]

Codecov Report

Patch coverage: 83.87% and project coverage change: +0.06 🎉

Comparison is base (41866c2) 47.10% compared to head (694bfd5) 47.16%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1197      +/-   ##
==========================================
+ Coverage   47.10%   47.16%   +0.06%     
==========================================
  Files          82       82              
  Lines       14606    14625      +19     
==========================================
+ Hits         6880     6898      +18     
- Misses       7726     7727       +1     

Impacted Files	Coverage Δ
dpgen/generator/lib/abacus_scf.py	80.91% <81.25%> (+0.55%)	⬆️
dpgen/auto_test/lib/abacus.py	87.92% <83.33%> (-0.20%)	⬇️
dpgen/auto_test/ABACUS.py	79.44% <87.50%> (+0.70%)	⬆️
dpgen/auto_test/Elastic.py	62.69% <100.00%> (ø)

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