[amp-consent]: Orientation changes makes banner half-cut on fullscreen

### Description

When orientation changes on an AMP page with amp-consent component, the CMP banner gets half-cut on fullscreen.

### Reproduction Steps

1) access https://www.google.com/amp/s/www.cio.com/article/3091071/8-things-you-need-to-know-about-google-amp.amp.html
2) once banner appears, click on 'Settings'
3) Change device orientation to landscape
4) See the banner is half cut

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome, Firefox, Safari

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Start by reproducing the amp-consent banner issue at the linked AMP page: open Settings, rotate the device to landscape, and compare Chrome, Firefox, and Safari. Trace the amp-consent component's fullscreen and orientation-change handling; done means the banner remains fully visible after rotation.

Written by the indexing model from the issue text.