Can't listen to native HTML5 audio events

[Sun0fABeach]

Issue description

After updating v5.0.3 -> v.5.1.0, listing to native HTML5 audio events no longer works.

Environment

• What's My Browser Support link: https://www.whatsmybrowser.org/b/3ZG9I

• Amplitude.js Version: 5.1.0

Steps to reproduce the issue

1. Init amplitude like so:

this.$amplitude.init({
  songs: [...], 
  callbacks: {
    stop: () => {
      console.log('stop')
    },
    play() {
      console.log('play')
    },
  }
})

2. Play a song

What is expected?

I can see both "stop" and "play" logged to the console.

Additional details / screenshots

Only "stop" is logged to the console. Any callback that I register for a native HTML5 audio element does not fire. Amplitude specific callback like stop do fire.