refactor: Use client.leaveBreadcrumb() directly
refactor: Use client.leaveBreadcrumb() directly

It's only in the Node notifier we can't use this and have to use
the prototype, since client.leaveBreadcrumb() is monkeypatched.

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