Fix facetIsDegenerated utility function

[MarkusFrankATcernch]

BEGINRELEASENOTES

• Fix to MR ASSIMP: adapt for changes in TGeoTesselated in ROOT #1212
  ENDRELEASENOTES

[andresailer]

Thanks!

[github-actions]

Test Results

    6 files      6 suites   4h 25m 8s ⏱️
  359 tests   355 ✅ 0 💤 4 ❌
1 061 runs  1 057 ✅ 0 💤 4 ❌

For more details on these failures, see this check.

Results for commit 8721b2b.

[andresailer]

Probably the epsilon too small, as you pointed out yesterday.
constexpr double epsilon = 1.e-20;

[MarkusFrankATcernch]

No. It did not take into account negative determinants....

[andresailer]

But it is failing tests related to ddcad...

[MarkusFrankATcernch]

@andresailer Hell, screwed it again!
Could you unroll please? This is getting too complicated in git for me.
The only important thing is the std::fabs(...) in the return.

[MarkusFrankATcernch]

@andresailer I do not get here any output on the failing slots:
https://github.com/AIDASoft/DD4hep/actions/runs/7544726687/job/20538715080