change(filter): use volto icons as fallback is iconComponent option i…

…sn't set

- this way we keep the backward compatibility whereby default the package uses
   volto svg icons

src/components/manage/Blocks/Accordion/util.js

@@ -56,7 +56,7 @@ export const Icon = (props) => {
     VoltoIcon,
   };
   // Get the component from the map based on the configuration
-  const IconComponent = componentMap[componentToRender] || SemanticIcon;
+  const IconComponent = componentMap[componentToRender] || VoltoIcon;
 
   return <IconComponent size={options.size} name={name} {...rest} />;
 };