fix(explore): make SORT-Descending visible if Sort-by has value (#17726)

superset-frontend/plugins/legacy-plugin-chart-horizon/src/controlPanel.ts

@@ -42,6 +42,8 @@ const config: ControlPanelConfig = {
               label: t('Sort Descending'),
               default: true,
               description: t('Whether to sort descending or ascending'),
+              visibility: ({ controls }) =>
+                Boolean(controls?.timeseries_limit_metric.value),
             },
           },
           {