Fix application of signal filtering when enabled

[fgrosa]

The latest fix in the signal filtering #14735 cured the segmentation fault in case of embedding patterns different from @0:e1, but also removed the signal filtering at all. This PR restores it @sawenzel

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 94fbe5e at 2025-10-27 21:23:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/14763-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.