Allow default option to be overriden if there is any conversion point that injects this default option

src/breakshaft/graph_walker.py

@@ -69,6 +69,16 @@ class GraphWalker:
                     variant_subgraphs.add(subg)
 
                 if not dead_end:
+
+                    for opt, _ in point.opt_args:
+                        subg = cls.generate_callgraph_singletype(injectors,
+                                                                 from_types,
+                                                                 opt,
+                                                                 visited_path=visited_path.copy(),
+                                                                 visited_types=visited_types.copy())
+                        if subg is not None:
+                            variant_subgraphs.add(subg)
+
                     consumed = frozenset(point.requires) & from_types
                     variant = CallgraphVariant(point, frozenset(variant_subgraphs), consumed)
                     head = head.add_subgraph_variant(variant)