Convert list of all base_files into set

Co-authored-by: Ghostkeeper <Ghostkeeper@users.noreply.github.com>

cura/Machines/MaterialNode.py

@@ -89,7 +89,7 @@ class MaterialNode(ContainerNode):
                 else:
                     qualities_any_material = container_registry.findInstanceContainersMetadata(type = "quality", definition = self.variant.machine.quality_definition)
 
-                all_material_base_files = [material_metadata["base_file"] for material_metadata in container_registry.findInstanceContainersMetadata(type = "material", material = my_material_type)]
+                all_material_base_files = {material_metadata["base_file"] for material_metadata in container_registry.findInstanceContainersMetadata(type = "material", material = my_material_type)}
 
                 qualities.extend((quality for quality in qualities_any_material if quality.get("material") in all_material_base_files))