Re-add missed during rebase

Author: andsel

x-pack/spec/monitoring/inputs/metrics/stats_event_factory_spec.rb

@@ -50,6 +50,7 @@
   let(:pipeline_settings) { LogStash::Runner::SYSTEM_SETTINGS.clone.merge({
     "pipeline.id" => "main",
     "config.string" => config,
+    "api.enabled" => webserver_enabled,
   }) }
 
   let(:agent) { LogStash::Agent.new(pipeline_settings) }