Don't generate app_uri.txt if the ruby_lsp_rails.server is false

Because the addon client uses the file's existence to determine whether
to send the request, if the file is generated when the server
feature is disabled, the client would just spam the server with requests.

We also don't need to append the Rack app if Rails server is not invoked.

Author: st0012

lib/ruby_lsp_rails/railtie.rb

@@ -12,15 +12,13 @@ class Railtie < ::Rails::Railtie
 
       initializer "ruby_lsp_rails.setup" do |_app|
         config.after_initialize do |app|
-          unless config.ruby_lsp_rails.server == false
+          # If we start the app with `bin/rails console` then `Rails::Server` is not defined.
+          if defined?(::Rails::Server) && config.ruby_lsp_rails.server
             app.routes.prepend do
               T.bind(self, ActionDispatch::Routing::Mapper)
               mount(RackApp.new => RackApp::BASE_PATH)
             end
-          end
 
-          # If we start the app with `bin/rails console` then `Rails::Server` is not defined.
-          if defined?(::Rails::Server)
             ssl_enable, host, port = ::Rails::Server::Options.new.parse!(ARGV).values_at(:SSLEnable, :Host, :Port)
             app_uri = "#{ssl_enable ? "https" : "http"}://#{host}:#{port}"
             app_uri_path = ::Rails.root.join("tmp", "app_uri.txt")