fixup! Exclusively use FeatureCheck helper in generator specs

`type_metatag` is the only method used in generator specs

Author: pirj

spec/spec_helper.rb

@@ -65,5 +65,5 @@ def self.run_all(reporter = nil)
     end
   end
 
-  config.include RSpec::Rails::FeatureCheck
+  config.include RSpec::Rails::FeatureCheck, type: :generator
 end