Remove redundant method

Author: djmb

lib/kamal/cli/app.rb

@@ -285,8 +285,4 @@ def current_running_version(host: KAMAL.primary_host)
     def version_or_latest
       options[:version] || KAMAL.config.latest_tag
     end
-
-    def web_and_non_web_roles?
-      KAMAL.roles.any?(&:running_traefik?) && !KAMAL.roles.all?(&:running_traefik?)
-    end
 end