DEV: update automation to remove custom: prefix

Author: keegangeorge

lib/automation.rb

@@ -37,7 +37,7 @@ def self.available_models
             value_h["id"] > 0 ||
               SiteSetting.ai_automation_allowed_seeded_models_map.include?(value_h["id"].to_s)
           end
-          .each { |value_h| value_h["id"] = "custom:#{value_h["id"]}" }
+          .each { |value_h| value_h["id"] = "#{value_h["id"]}" }
 
       values
     end