Remove duplicate items from search autocomplete

Old behaviour gave you duplicate entries if your project is public
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/helpers/search_helper.rb

@@ -8,7 +8,9 @@ module SearchHelper
       default_autocomplete,
       project_autocomplete,
       help_autocomplete
-    ].flatten.to_json
+    ].flatten.uniq do |item|
+      item[:label]
+    end.to_json
   end
 
   private