frontend: fix lint

Author: GGeethanjali

frontend/src/index.js

@@ -108,8 +108,8 @@ async function graphHistory(history, path) {
 }
 
 async function showDirectory(dir, revision, files) {
-  files.sort(function (file1, file2) {
-    return file1.coveragePercent - file2.coveragePercent
+  files.sort(function(file1, file2) {
+    return file1.coveragePercent - file2.coveragePercent;
   });
   const context = {
     navbar: buildNavbar(dir, revision),