Remove references to service in flowdock model spec

spec/models/integrations/flowdock_spec.rb

@@ -9,7 +9,7 @@ RSpec.describe Integrations::Flowdock do
   end
 
   describe 'Validations' do
-    context 'when service is active' do
+    context 'when integration is active' do
       before do
         subject.active = true
       end
@@ -17,7 +17,7 @@ RSpec.describe Integrations::Flowdock do
       it { is_expected.to validate_presence_of(:token) }
     end
 
-    context 'when service is inactive' do
+    context 'when integration is inactive' do
       before do
         subject.active = false
       end