change default compSolids behaviour

[alexvalentine94]

Description

The default behaviour for compSolids setting was set to True. This leads to solids in a single component being merged in the MCNP model cell definitions. The default should be false to respect the original structure tree.

Fixes issue

Checklist

• I'm making a PR from a feature branch on my fork into GEOUNED-org/GEOUNED/dev branch
• I have followed PEP8 style guide for Python or run a formatter such as black or ruff format on my code
• I have made corresponding changes to the documentation
• [] I have added tests that prove my fix is effective or that my feature works

[shimwell]

looks like the code is attempting to append to a bool somewhere and this is causing the tests to fail

this does not look like it is introduced by the PR but rather a part of the code that was not previously being executed in the CI.

looks like the error is on
geouned/GEOUNED/void/void_box_class.py line 351 in get_void_complementary which calls complementary.append(compSeq)

I guess complementary is the bool and is not appendable

[psauvan]

I have fixed the problem with the boolean value, and updated dev branch (#247).
I rerun the tests but they still fail, it seems the tests are using the original source.

[alexvalentine94]

I have merged your fix Patrick, thanks for pointing to this. Tests passing now :)