Remove a warning from eslint

The weird thing is, this pattern occurs in other place as well.
But only this place is corrected.

portal/src/TextFieldWithCopyButton.tsx

@@ -14,7 +14,6 @@ const TextFieldWithCopyButton: React.VFC<TextFieldWithCopyButtonProps> =
   function TextFieldWithCopyButton(props: TextFieldWithCopyButtonProps) {
     const { disabled, additionalIconButtons, ...rest } = props;
     const { themes } = useSystemConfig();
-    // eslint-disable-next-line no-useless-assignment
     const { copyButtonProps, Feedback } = useCopyFeedback({
       textToCopy: props.value ?? "",
     });