Move fixture_path out of support/rspec file which is used by fast_spec_helper, so that fast specs can be run on its own again.

Move `fixture_path` config together with use_transactional_fixtures and
use_instantiated_fixtures. These settings are all added by rspec-rails

8c6c9590b9/lib/rspec/rails/configuration.rb (L65-L67)

spec/spec_helper.rb

@@ -42,6 +42,7 @@ Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }
 RSpec.configure do |config|
   config.use_transactional_fixtures = false
   config.use_instantiated_fixtures  = false
+  config.fixture_path = Rails.root
 
   config.verbose_retry = true
   config.display_try_failure_messages = true

spec/support/rspec.rb

@@ -11,6 +11,4 @@ RSpec.configure do |config|
   config.include StubMetrics
   config.include StubObjectStorage
   config.include StubENV
-
-  config.fixture_path = Rails.root if defined?(Rails)
 end