fix ´onDelete´ function type

src/lib/components/NameItemEditor.svelte

@@ -15,7 +15,7 @@
 	export let currentName: string;
 	export let vorgangToken: string | null;
 	export let onSave: (n: string, o: string, t?: string) => unknown = () => {};
-	export let onDelete: (n: string) => unknown | null = () => {};
+	export let onDelete: ((n: string) => unknown) | null = () => {};
 
 	let localName = currentName;
 	let isEditing = false;