Fixing the acts extension.

Removing the orientation of the layer (string arguments).

src/SimpleDiskTracker_geo.cpp

@@ -92,7 +92,7 @@ static Ref_t create_detector(Detector& description, xml_h e, SensitiveDetector s
       if (x_slice.isSensitive()) {
         sens.setType("tracker");
         s_vol.setSensitiveDetector(sens);
-        Acts::ActsExtension* moduleExtension = new Acts::ActsExtension("XZY");
+        Acts::ActsExtension* moduleExtension = new Acts::ActsExtension();
         slice_de.addExtension<Acts::ActsExtension>(moduleExtension);
       }
       s_vol.setAttributes(description, x_slice.regionStr(), x_slice.limitsStr(), x_slice.visStr());