Wrong DETECTOR_PROJECT_ROOT

@clemenci @bcouturi @rmatev @gcorti

When running Gauss-on-Gaussino, which uses DETECTOR_PROJECT_ROOT in order to find compact/trunk/defaults.xml, I have found that that it is set as /workspace/build/Detector instead of sth like /directory_of_the_nightlies/lhcb-gaussino/1071/Detector as for all other projects.

links:

Is that expected? It looks like it is set in a similar way as in other projects: Detector!96 (merged). Thanks for your help!

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