Add and apply RSpec/MetadataStyle rubocop rule

This rule was introduced in rubocop-rspec 2.24.0. We were applying it
most of the time.

.rubocop.yml

@@ -564,6 +564,9 @@ RSpec/LetBeforeExamples:
 RSpec/LetSetup:
   Enabled: true
 
+RSpec/MetadataStyle:
+  Enabled: true
+
 RSpec/NotToNot:
   Enabled: true
 

spec/spec_helper.rb

@@ -63,7 +63,7 @@ RSpec.configure do |config|
     Capybara.default_set_options = { clear: :backspace }
   end
 
-  config.before(:each, type: :system, no_js: true) do
+  config.before(:each, :no_js, type: :system) do
     driven_by :rack_test
     Capybara.default_set_options = {}
   end