Fix warning about constants in routes (#19466)

config/routes.rb

@@ -3,9 +3,10 @@
 require 'sidekiq_unique_jobs/web'
 require 'sidekiq-scheduler/web'
 
+Rails.application.routes.draw do
   # Paths of routes on the web app that to not require to be indexed or
   # have alternative format representations requiring separate controllers
-WEB_APP_PATHS = %w(
+  web_app_paths = %w(
     /getting-started
     /keyboard-shortcuts
     /home
@@ -28,7 +29,6 @@ WEB_APP_PATHS = %w(
     /mutes
   ).freeze
 
-Rails.application.routes.draw do
   root 'home#index'
 
   mount LetterOpenerWeb::Engine, at: 'letter_opener' if Rails.env.development?
@@ -677,7 +677,7 @@ Rails.application.routes.draw do
     end
   end
 
-  WEB_APP_PATHS.each do |path|
+  web_app_paths.each do |path|
     get path, to: 'home#index'
   end