Part: modernize C++: return braced init list

src/Mod/Part/App/HLRBRep/HLRBRep_PolyAlgoPyImp.cpp

@@ -75,7 +75,7 @@ int HLRBRep_PolyAlgoPy::PyInit(PyObject* args, PyObject* /*kwds*/)
 // returns a string which represents the object e.g. when printed in python
 std::string HLRBRep_PolyAlgoPy::representation() const
 {
-    return std::string("<HLRBRep_PolyAlgo object>");
+    return {"<HLRBRep_PolyAlgo object>"};
 }
 
 PyObject* HLRBRep_PolyAlgoPy::setProjector(PyObject *args, PyObject *kwds)