test(services_spec): remove temporary suse conditional

* `train` gem has been fixed upstream
  - inspec/train#451
  - https://rubygems.org/gems/train/versions/2.1.7

test/integration/default/controls/services_spec.rb

@@ -4,10 +4,6 @@
   service_name = 'crond'
 end
 
-# Temporary `if` due to `opensuse-leap-15` bug re: `service`
-if os[:name] == 'suse'
-  puts "[Skip `service`-based tests due to `opensuse-leap-15` detection bug (see https://github.com/inspec/train/issues/377)]"
-else
 control 'Template service' do
   impact 0.5
   title 'should be running and enabled'
@@ -17,4 +13,3 @@
     it { should be_running }
   end
 end
-end