Fix --snake-case-field breaks class_name

[koxudaxi]

No description provided.

[codecov]

Codecov Report

Merging #777 (7448da0) into master (e9b6edf) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##            master      #777     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           11        21     +10     
  Lines         1020      2502   +1482     
  Branches       201       556    +355     
===========================================
+ Hits          1020      2502   +1482     

Flag	Coverage Δ
unittests	99.92% <99.89%> (?)

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Impacted Files	Coverage Δ
datamodel_code_generator/model/__init__.py	100.00% <ø> (ø)
datamodel_code_generator/__init__.py	100.00% <100.00%> (ø)
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/format.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
...atamodel_code_generator/model/pydantic/__init__.py	100.00% <100.00%> (ø)
...amodel_code_generator/model/pydantic/base_model.py	100.00% <100.00%> (ø)
... and 18 more

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