Refactor UserCalloutsController enum check

app/controllers/user_callouts_controller.rb

 class UserCalloutsController < ApplicationController
   def create
-    if check_feature_name && ensure_callout
+    if ensure_callout.persisted?
       respond_to do |format|
         format.json { head :ok }
       end
@@ -13,15 +13,11 @@ class UserCalloutsController < ApplicationController
 
   private
 
-  def check_feature_name
-    UserCallout.feature_names.keys.include?(callout_param)
-  end
-
   def ensure_callout
-    current_user.callouts.find_or_create_by(feature_name: callout_param)
+    current_user.callouts.find_or_create_by(feature_name: UserCallout.feature_names[feature_name])
   end
 
-  def callout_param
+  def feature_name
     params.require(:feature_name)
   end
 end