Use OCCT Handle macro for Handle_ classes

This is the result of running OCCT's upgrade script provided
with OCCT 7.0. See
https://www.opencascade.com/content/freecad-occt710-and-windows-rtti-data-missing#comment-form
and
https://www.forum.freecadweb.org/viewtopic.php?f=4&t=21405&start=120#p169019
for why this is necessary for OCCT >= 7.1

src/Mod/PartDesign/App/FeaturePad.cpp

@@ -234,7 +234,7 @@ App::DocumentObjectExecReturn *Pad::execute(void)
         return App::DocumentObject::StdReturn;
     }
     catch (Standard_Failure) {
-        Handle_Standard_Failure e = Standard_Failure::Caught();
+        Handle(Standard_Failure) e = Standard_Failure::Caught();
         if (std::string(e->GetMessageString()) == "TopoDS::Face")
             return new App::DocumentObjectExecReturn("Could not create face from sketch.\n"
                 "Intersecting sketch entities or multiple faces in a sketch are not allowed.");