Fix wiki project clone address error

CHANGELOG

@@ -33,6 +33,7 @@ v 8.8.3
   - Fix import URL migration not rescuing with the correct Error
   - In search results, only show notes on confidential issues that the user has access to
   - Fix health check access token changing due to old application settings being used
+  - Fix wiki project clone address error (chujinjin)
 
 v 8.8.2
   - Added remove due date button. !4209

app/helpers/button_helper.rb

@@ -30,7 +30,7 @@ module ButtonHelper
 
     content_tag :a, protocol,
       class: klass,
-      href: @project.http_url_to_repo,
+      href: project.http_url_to_repo,
       data: {
         html: true,
         placement: 'right',