[truffelruby-support] codestyle updates

Author: 0exp

spec/features/run_code_with_temporary_settings_spec.rb

@@ -22,7 +22,7 @@
     expect(config.settings.api.login).to eq('D@iVeR')
   end
 
-  unless RUBY_ENGINE.include?("truffleruby")
+  unless RUBY_ENGINE.include?('truffleruby')
     specify 'thread-safety' do
       config = Qonfig::DataSet.build do
         setting :api do