Improve segmentation of material LUT generation

[shahor02]

See https://its.cern.ch/jira/browse/O2-6417 for difference.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for da5716c at 2025-10-27 20:02:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/14771-slc9_x86-64/0/Detectors/Base/test/buildMatBudLUT.C:20:10: fatal error: ITS3Simulation/DescriptorInnerBarrelITS3.h: No such file or directory
ninja: build stopped: subcommand failed.

Full log here.

[vkucera]

This breaks the build on Linux.

[shahor02]

Sorry, checking