Remove FORCE option as it was only needed for tests

- Adjusted tests instead.

railties/lib/rails/tasks/framework.rake

@@ -48,7 +48,7 @@ namespace :app do
           require 'rails/generators'
           require 'rails/generators/rails/app/app_generator'
           gen = Rails::Generators::AppGenerator.new ["rails"],
-                                                    { api: !!Rails.application.config.api_only, update: true, force: ENV['FORCE'] },
+                                                    { api: !!Rails.application.config.api_only, update: true },
                                                     destination_root: Rails.root
           File.exist?(Rails.root.join("config", "application.rb")) ?
             gen.send(:app_const) : gen.send(:valid_const?)

railties/test/generators/app_generator_test.rb

@@ -208,7 +208,9 @@ def test_rails_update_does_not_create_new_framework_defaults_by_default
     FileUtils.rm("#{app_root}/config/initializers/new_framework_defaults.rb")
 
     stub_rails_application(app_root) do
-      quietly { `FORCE=true bin/rails app:update` }
+      generator = Rails::Generators::AppGenerator.new ["rails"], { update: true }, destination_root: app_root, shell: @shell
+      generator.send(:app_const)
+      quietly { generator.send(:update_config_files) }
 
       assert_file "#{app_root}/config/initializers/new_framework_defaults.rb" do |content|
         assert_match(/ActiveSupport\.halt_callback_chains_on_return_false = true/, content)