Don't error when checking user roles on a project

Substitute the call to the overwritten `Project.find_by_name` finder
method with plain ActiveRecord finder methods. Make sure the
`user_has_role?` method is always called on a project.

src/api/app/controllers/webui/request_controller.rb

@@ -352,9 +352,11 @@ def addreview_opts
   end
 
   def any_project_maintained_by_current_user?
-    projects = @actions.select(:target_project).distinct.pluck(:target_project)
+    projects = Project.where(name: @actions.select(:target_project)).distinct
     maintainer_role = Role.find_by_title('maintainer')
-    projects.any? { |project| Project.find_by_name(project).user_has_role?(User.possibly_nobody, maintainer_role) }
+    user = User.possibly_nobody
+
+    projects.any? { |project| project.user_has_role?(user, maintainer_role) }
   end
 
   def new_state