restore React.createElement in application site

Author: mununki

cli/reactjs_jsx_ppx_v3.ml

@@ -330,12 +330,12 @@ let jsxMapper () =
     match !childrenArg with
     | None ->
         Exp.apply ~loc ~attrs
-          (Exp.ident ~loc { txt = ident; loc })
-          [ (nolabel, props) ]
+          (Exp.ident ~loc { loc; txt = Ldot (Lident "React", "createElement") })
+          [ (nolabel, Exp.ident ~loc { txt = ident; loc }); (nolabel, props) ]
     | Some children ->
         Exp.apply ~loc ~attrs
-          (Exp.ident ~loc { txt = ident; loc })
-          [ (nolabel, props); (nolabel, children) ]
+          (Exp.ident ~loc { loc; txt = Ldot (Lident "React", "createElementVariadic") })
+          [ (nolabel, Exp.ident ~loc { txt = ident; loc }); (nolabel, props); (nolabel, children) ]
     [@@raises Invalid_argument]
   in