Use tag helper for javascript tag in redirect

This will automatically include the nonce for CSP

app/views/doorkeeper/authorizations/redirect.html.haml

@@ -3,5 +3,6 @@
 %div
   %a{ :href => redirect_uri } Click here to redirect to #{redirect_uri}
 
-:javascript
-  window.location= "#{redirect_uri}";
+= javascript_tag do
+  :plain
+    window.location= "#{redirect_uri}";