DummyGenerator: Remove unused script/rails file

This file gets copied into the wrong folder and is not
used by Rails since decades.

Author: tvdeyen

core/lib/generators/spree/dummy/dummy_generator.rb

@@ -61,7 +61,6 @@ def test_dummy_config
       template "rails/application.rb.tt", "#{dummy_path}/config/application.rb", force: true
       template "rails/routes.rb", "#{dummy_path}/config/routes.rb", force: true
       template "rails/test.rb", "#{dummy_path}/config/environments/test.rb", force: true
-      template "rails/script/rails", "#{dummy_path}/spec/dummy/script/rails", force: true
     end
 
     def test_dummy_inject_extension_requirements