Remove fetch from AppSec::Response for getting status_code

lib/datadog/appsec/response.rb

@@ -87,7 +87,7 @@ def block_response(env, options)
           body << content(content_type)
 
           Response.new(
-            status: options.fetch('status_code', 403).to_i,
+            status: options['status_code']&.to_i || 403,
             headers: { 'Content-Type' => content_type },
             body: body,
           )