args: remove duplicated argument

[njzjz]

I don't notice it's duplicated in #829 but the unit test in #821 has thrown errors.

[codecov-commenter]

Codecov Report

Merging #839 (78bdf33) into devel (5a57de2) will increase coverage by 0.77%.
The diff coverage is 62.54%.

@@            Coverage Diff             @@
##            devel     #839      +/-   ##
==========================================
+ Coverage   35.16%   35.93%   +0.77%     
==========================================
  Files          96       97       +1     
  Lines       16817    17094     +277     
==========================================
+ Hits         5913     6143     +230     
- Misses      10904    10951      +47     

Impacted Files	Coverage Δ
dpgen/auto_test/common_prop.py	38.15% <40.00%> (-0.10%)	⬇️
dpgen/auto_test/Gamma.py	61.13% <61.13%> (ø)
dpgen/auto_test/Lammps.py	30.94% <100.00%> (ø)
dpgen/generator/arginfo.py	99.20% <100.00%> (+50.06%)	⬆️

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