Move check_api_readable to api_controller

It's easier to skip the check in the two places that we need to, and
include it by default everywhere else.

app/controllers/api/ways_controller.rb

@@ -1,6 +1,5 @@
 module Api
   class WaysController < ApiController
-    before_action :check_api_readable
     before_action :check_api_writable, :only => [:create, :update, :delete]
     before_action :authorize, :only => [:create, :update, :delete]