Override `MiqWorker::Runner.start` in MiqWebServerRunnerMixin
Override `MiqWorker::Runner.start` in MiqWebServerRunnerMixin

This allows us access to the worker object in run_single_worker.rb
and also allows the web service workers to start the rails server
which was broken in 7776e35c877e2ee344f858dbd3c46d58543a2b16.

The original change altered the call in run_single_worker.rb
to call Runner#start rather than Runner.start_worker which
missed this code when running a web server worker.

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