Revert "feat: setting for carveMultipleVolumes (CURA-2712)"

This reverts commit b2d837efde.

src/FffPolygonGenerator.cpp

@@ -115,10 +115,7 @@ bool FffPolygonGenerator::sliceModel(MeshGroup* meshgroup, TimeKeeper& timeKeepe
 
     Progress::messageProgressStage(Progress::Stage::PARTS, &timeKeeper);
 
-    if (storage.getSettingBoolean("carve_multiple_volumes"))
-    {
-        carveMultipleVolumes(slicerList);
-    }
+    carveMultipleVolumes(slicerList);
     generateMultipleVolumesOverlap(slicerList);
 
     storage.meshes.reserve(slicerList.size()); // causes there to be no resize in meshes so that the pointers in sliceMeshStorage._config to retraction_config don't get invalidated.