add: issue chosen assign_user permission

app/helpers/tag_chosen_helper.rb

@@ -182,7 +182,7 @@ module TagChosenHelper
         real_name = user.try(:show_real_name)
         user_id = user.id
         is_chosen = ((user.id.to_s == issue_info[0].to_s) ? "1" : "0")
-        member_info = {id: user_id, name: real_name,avatar_url: url_to_avatar(user),is_chosen: is_chosen}
+        member_info = {id: user_id, name: real_name,avatar_url: url_to_avatar(user), permission: project.get_premission(user), is_chosen: is_chosen}
         project_members_info.push(member_info)
       end
     end