Fix login method in unread badge spec for consistency

Author: rsmithlal

spec/features/notifications/unread_badge_spec.rb

@@ -9,7 +9,7 @@
   before do
     configure_host_platform
     logout(:user)
-    login_as_platform_manager
+    login('[email protected]', 'password12345')
   end
 
   it 'updates badge and title based on unread count', :js do # rubocop:todo RSpec/ExampleLength, RSpec/MultipleExpectations