[QA] Hovering cursor on speaker is showing unwanted UI

### Description

Hovering cursor on speaker is showing unwanted UI

### Reproduction Steps

Test Case - [1.5.3 amp-audio/play]

Playground Link - https://playground.amp.dev/?url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-audio&format=websites

Steps:
1) Launch playground link.
2) Hover on the speaker icon.

Observed : Unwanted UI is showing up.
Screenshot - https://screenshot.googleplex.com/Aqq4ahWAEnWKLFF
Screen-recording - https://recall.googleplex.com/projects/a7de2a7e-e05b-474c-9c85-94728bb8c202/sessions/33208952-06cb-4d2b-99f1-54482e6ebaf2

Expected : It's good to remove that UI.

### Relevant Logs

_No response_

### Browser(s) Affected

Safari

### OS(s) Affected

NA

### Device(s) Affected

Mac

### AMP Version Affected

2308112021001