Ignore callbacks in routes list
Ignore callbacks in routes list

The CLI command Routes iterates routes from system & app to display them as a table, but ends up trying to display callbacks. This change ignores any `$to` destinations that aren't strings.
lonnieezell/CodeIgniter4,kenjis/CodeIgniter4,jim-parry/CodeIgniter4,natanfelles/CodeIgniter4,kenjis/CodeIgniter4,jim-parry/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,ytetsuro/CodeIgniter4,gustavojm/CodeIgniter4,butane/CodeIgniter4,butane/CodeIgniter4,samsonasik/CodeIgniter4,bcit-ci/CodeIgniter4,jim-parry/CodeIgniter4,lonnieezell/CodeIgniter4,jim-parry/CodeIgniter4,ytetsuro/CodeIgniter4,gustavojm/CodeIgniter4,natanfelles/CodeIgniter4,jim-parry/CodeIgniter4,lonnieezell/CodeIgniter4,butane/CodeIgniter4,jim-parry/CodeIgniter4,samsonasik/CodeIgniter4,kenjis/CodeIgniter4,ytetsuro/CodeIgniter4,lonnieezell/CodeIgniter4,gustavojm/CodeIgniter4,ytetsuro/CodeIgniter4,bcit-ci/CodeIgniter4,lonnieezell/CodeIgniter4,natanfelles/CodeIgniter4,natanfelles/CodeIgniter4,butane/CodeIgniter4,bcit-ci/CodeIgniter4,samsonasik/CodeIgniter4,samsonasik/CodeIgniter4,kenjis/CodeIgniter4,samsonasik/CodeIgniter4,bcit-ci/CodeIgniter4,kenjis/CodeIgniter4,ytetsuro/CodeIgniter4,butane/CodeIgniter4,gustavojm/CodeIgniter4,natanfelles/CodeIgniter4,butane/CodeIgniter4,lonnieezell/CodeIgniter4,natanfelles/CodeIgniter4