🐛 correctly set panel widths (bug in HSL 9)

src/app.config.ts

@@ -177,7 +177,8 @@ export const AppConfig = {
     },
   },
   panelWidths: {
-    datasource_selector: 400,
+    default: 450,
+    datasource_selector: 450,
   },
   // allowAddExternalDatasets: false,
   panelsEnabled: {