Enable StaticAttributeDefinedDynamically cop & fix

rubocop-rspec gem includes cops for FactoryBot like the new
 FactoryBot/StaticAttributeDefinedDynamically to enforce declaring
 static attribute values without a block.

* http://www.rubydoc.info/gems/rubocop-rspec/1.24.0/RuboCop/Cop/RSpec/FactoryBot/StaticAttributeDefinedDynamically

.rubocop.yml

@@ -403,6 +403,9 @@ RSpec/VerifiedDoubles:
 RSpec/VoidExpect:
   Enabled: true
 
+FactoryBot/StaticAttributeDefinedDynamically:
+  Enabled: true
+
 Security/Eval:
   Enabled: true
 

spec/factories.rb

@@ -638,13 +638,13 @@ FactoryBot.define do
   factory :poll_partial_result, class: 'Poll::PartialResult' do
     association :question, factory: [:poll_question, :with_answers]
     association :author, factory: :user
-    origin { 'web' }
+    origin 'web'
     answer { question.question_answers.sample.title }
   end
 
   factory :poll_recount, class: 'Poll::Recount' do
     association :author, factory: :user
-    origin { 'web' }
+    origin 'web'
   end
 
   factory :officing_residence, class: 'Officing::Residence' do