Don't duplicate attaching metadata
Don't duplicate attaching metadata

There's no need to attach metadata if ctx.bugsnag exists as we know
we have added an onError callback to record the metadata already

This was previously required as the errorHandler and requestHandler
were totally independant

bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js,bugsnag/bugsnag-js