Redirected inside amp-access-poool iframe on click events

## What's the issue?

Actions inside `amp-access-poool` component that usually needs a redirect are redirected inside its iframe.

## How do we reproduce the issue?

https://jsbin.com/tuyerex/edit?html,output

Click on  "Je m'abonne" inside the component and be redirected inside the iframe

## What browsers are affected?

All

## Which AMP version is affected?

1906282130140
