Fix a lint warning in frontend/src/metabase/lib/urls.js

frontend/src/metabase/lib/urls.js

@@ -43,8 +43,9 @@ export const extractQueryParams = (query: Object): Array => {
 };
 
 const flattenParam = ([key, value]) => {
-  if (value instanceof Array) return value.map(p => [key, p]);
-
+  if (value instanceof Array) {
+    return value.map(p => [key, p]);
+  }
   return [[key, value]];
 };