Do not use has_controller? method

This method has been deprecated and we do not want to use it
internally to avoid loggin deprecation warnings.

app/controllers/concerns/alchemy/page_redirects.rb

@@ -49,7 +49,7 @@ def public_child_redirect_url
     end
 
     def controller_and_action_url
-      return unless @page.has_controller?
+      return unless @page.definition['controller']
 
       main_app.url_for(@page.controller_and_action)
     end

app/models/alchemy/page/page_natures.rb

@@ -74,7 +74,7 @@ def locked?
 
     # @deprecated Please use a menu node with an url pointing to your controller path instead.
     def controller_and_action
-      if has_controller?
+      if definition['controller']
         {
           controller: definition["controller"].gsub(/(^\b)/, "/#{$1}"),
           action: definition["action"]

spec/models/alchemy/page_spec.rb

@@ -2211,7 +2211,6 @@ module Alchemy
 
       context 'if the page has a custom controller defined in its definition' do
         before do
-          allow(page).to receive(:has_controller?).and_return(true)
           allow(page).to receive(:definition).and_return({'controller' => 'comments', 'action' => 'index'})
         end
         it "should return a Hash with controller and action key-value pairs" do