remove duplicated convert_13_to_21

[njzjz]

Strange, I added duplicated convert_13_to_21 in #1597.

[codecov-commenter]

Codecov Report

Base: 73.56% // Head: 28.97% // Decreases project coverage by -44.58% ⚠️

Coverage data is based on head (7784c2e) compared to base (77c7ad4).
Patch has no changes to coverable lines.

❗ Current head 7784c2e differs from pull request most recent head 8bfd008. Consider uploading reports for the commit 8bfd008 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##            devel    #1986       +/-   ##
===========================================
- Coverage   73.56%   28.97%   -44.59%     
===========================================
  Files         198      196        -2     
  Lines       19916    18306     -1610     
  Branches      854        0      -854     
===========================================
- Hits        14651     5305     -9346     
- Misses       4877    13001     +8124     
+ Partials      388        0      -388     

Impacted Files	Coverage Δ
deepmd/utils/convert.py	19.44% <ø> (+0.47%)	⬆️
source/op/soft_min_virial_grad.cc	3.63% <0.00%> (-90.96%)	⬇️
source/op/soft_min_virial.cc	3.84% <0.00%> (-90.60%)	⬇️
source/op/prod_virial_grad_multi_device.cc	1.55% <0.00%> (-89.96%)	⬇️
source/op/soft_min_force_grad.cc	4.08% <0.00%> (-89.86%)	⬇️
source/op/prod_force_grad_multi_device.cc	1.73% <0.00%> (-88.78%)	⬇️
deepmd/nvnmd/entrypoints/wrap.py	7.51% <0.00%> (-88.73%)	⬇️
deepmd/nvnmd/entrypoints/mapt.py	11.37% <0.00%> (-88.16%)	⬇️
source/op/soft_min_force.cc	5.00% <0.00%> (-87.86%)	⬇️
source/op/soft_min.cc	3.07% <0.00%> (-87.84%)	⬇️
... and 129 more

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