Fix the gitignore pattern for index.js in modules

GitOrigin-RevId: c5fef305f47a5e738790c079b17cef330f858d4c

services/web/.gitignore

@@ -86,7 +86,7 @@ config/*.coffee
 
 modules/**/Makefile
 
-modules/**/index.js
+modules/*/index.js
 modules/**/app/js/*
 modules/**/test/unit/js/*
 modules/**/test/acceptance/js/*