Adapt api.AudioWorkletNode.processorerror_event to new events structure (#15044)
Adapt api.AudioWorkletNode.processorerror_event to new events structure (#15044)

This PR adapts the processorerror event of the AudioWorkletNode API to conform to the new events structure.  Part of work for #14578.
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data