Set modal height to Adyen component height

[wannevancamp]

Summary

When a QR/3DS modal is shown and the Adyen component is bigger than the modal, a scroll bar is shown. When removing the height from the modal, the modal height will automatically adapt to the height of the component.

The height on the modal was introduced when the modal had a header which has since been removed. See: https://github.com/wannevancamp/adyen-shopware6/commit/88b622df269bce464733e9b408ae238e5e08ca55

Tested scenarios

Mobile before

Mobile after

Desktop before

Desktop after