fix LAMMPS_VERSION_NUMBER condition

[njzjz]

When I debug #1109, I accidentally find the LAMMPS_VERSION_NUMBER condition is wrong, making builds fail. (but this is not related to #1109)

[codecov-commenter]

Codecov Report

Merging #1116 (b9d1d08) into devel (2a71494) will decrease coverage by 11.32%.
The diff coverage is n/a.

❗ Current head b9d1d08 differs from pull request most recent head 800a1ef. Consider uploading reports for the commit 800a1ef to get more accurate results

@@             Coverage Diff             @@
##            devel    #1116       +/-   ##
===========================================
- Coverage   75.61%   64.28%   -11.33%     
===========================================
  Files          88        5       -83     
  Lines        7016       14     -7002     
===========================================
- Hits         5305        9     -5296     
+ Misses       1711        5     -1706     

Impacted Files	Coverage Δ
deepmd/entrypoints/compress.py
deepmd/infer/model_devi.py
deepmd/utils/data_system.py
deepmd/utils/tabulate.py
deepmd/entrypoints/__init__.py
deepmd/__main__.py
deepmd/__init__.py
deepmd/loggers/__init__.py
deepmd/utils/weight_avg.py
source/op/_gelu.py
... and 73 more

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