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

Author: myii

test/integration/default/controls/services_spec.rb

@@ -7,11 +7,6 @@
   pg_port = 5433
 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)]"
-  puts "[Skip `service`-based tests due to `opensuse-leap-15` bug]"
-else
 control 'Postgres service' do
   impact 0.5
   title 'should be running and enabled'
@@ -25,4 +20,3 @@
     it { should be_listening }
   end
 end
-end