Simplify datasets assignment

extensions/ql-vscode/src/view/compare-performance/ComparePerformance.tsx

@@ -369,7 +369,7 @@ function ComparePerformanceWithData(props: {
 }) {
   const { data } = props;
 
-  const datasets = useMemo(
+  const { from, to } = useMemo(
     () => ({
       from: new ComparisonDataset(data.from),
       to: new ComparisonDataset(data.to),
@@ -387,8 +387,6 @@ function ComparePerformanceWithData(props: {
 
   const [metric, setMetric] = useState<Metric>(metrics.tuples);
 
-  const { from, to } = datasets;
-
   const nameSet = new Set(from.data.names);
   for (const name of to.data.names) {
     nameSet.add(name);