create reference surface 1mm in front of first measurement

Tracking/Acts/FaserActsKalmanFilter/src/CircleFitTrackSeedTool.cxx

@@ -154,7 +154,7 @@ StatusCode CircleFitTrackSeedTool::run() {
       selectedSeeds.begin(), selectedSeeds.end(), [](const Seed &lhs, const Seed &rhs) {
         return lhs.minZ < rhs.minZ;
       });
-  double origin = !selectedSeeds.empty() ? minSeed->minZ : 0;
+  double origin = !selectedSeeds.empty() ? minSeed->minZ - 1 : 0;
   m_targetZPosition = origin;
   std::vector<Acts::CurvilinearTrackParameters> initParams {};
   for (const Seed &seed : selectedSeeds) {