Fix installing in fresh Rails app with Stimulus

Fresh Rails apps with Stimulus installed already have
a `app/javascript/controller/index.js` file with boilerplate
code. Since we install this file as well we need to
overwrite it if auto acept is enabled.

(cherry picked from commit 96aa506)

template.rb

@@ -101,7 +101,7 @@
 end
 
 with_log['installing files'] do
-  directory 'app', 'app', verbose: false
+  directory 'app', 'app', verbose: auto_accept, force: auto_accept
   directory 'public', 'public'
 
   copy_file 'config/initializers/solidus_auth_devise_unauthorized_redirect.rb'