FIX: onDelete and onCancel are mandatory properties

In general optional arguments are a bad idea, because you loose the type
and all it's benefits.

Did you forget an argument or you didn't need it?

webapp/src/components/NameManagerDialog/NamedRangeActive.tsx

@@ -18,8 +18,8 @@ interface NamedRangeProperties {
   scope?: number;
   formula: string;
   onSave: () => void;
-  onDelete?: () => void;
-  onCancel?: () => void;
+  onDelete: () => void;
+  onCancel: () => void;
 }
 
 function NamedRangeActive(properties: NamedRangeProperties) {