145 fix custom partial generation

[Sevitas]

Motivation

Fixes #145

Checklist

• [x] Code follows coding conventions held in this repo
• [x] Automated tests have been added
• [x] Tests are passing
• [x] Docs have been updated (if applicable)
• [x] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

Check if regenerated partial management models are not modified

[codecov[bot]]

Codecov Report

Merging #146 (987df82) into vNext (9614593) will decrease coverage by 2.76%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            vNext     #146      +/-   ##
==========================================
- Coverage   89.90%   87.13%   -2.77%     
==========================================
  Files          23       23              
  Lines         832      832              
  Branches       78       77       -1     
==========================================
- Hits          748      725      -23     
- Misses         82       89       +7     
- Partials        2       18      +16     

Impacted Files	Coverage Δ
...Generator.Core/Common/ClassCodeGeneratorFactory.cs	100.00% <100.00%> (ø)
...o.Kontent.ModelGenerator.Core/CodeGeneratorBase.cs	49.36% <0.00%> (-8.87%)	:arrow_down:
...rator.Core/Generators/TypeProviderCodeGenerator.cs	78.12% <0.00%> (-7.82%)	:arrow_down:
...c/Kentico.Kontent.ModelGenerator/ArgumentParser.cs	90.00% <0.00%> (-4.29%)	:arrow_down:
...or.Core/Generators/Class/BaseClassCodeGenerator.cs	86.27% <0.00%> (-3.93%)	:arrow_down:
src/Kentico.Kontent.ModelGenerator/Program.cs	83.87% <0.00%> (-3.23%)	:arrow_down:
...ntent.ModelGenerator.Core/DeliveryCodeGenerator.cs	74.68% <0.00%> (-2.54%)	:arrow_down:
...ent.ModelGenerator.Core/ManagementCodeGenerator.cs	87.27% <0.00%> (-1.82%)	:arrow_down:
...ico.Kontent.ModelGenerator.Core/Common/Property.cs	96.61% <0.00%> (-1.70%)	:arrow_down:

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