[Transform] Remove output tensor from value_info in insert_hook transform

src/finn/transformation/fpgadataflow/insert_hook.py

@@ -122,6 +122,7 @@ class InsertHook(Transformation):
                             else:
                                 model.graph.output.pop()
                                 model.graph.output.append(chk_otensor)
+                                model.graph.value_info.remove(chk_otensor)
                                 model = model.transform(GiveUniqueNodeNames())
                                 model = model.transform(GiveReadableTensorNames())
                             graph_modified = True