audio-headphones-symbolic not all sizes curved

### What Happened?

Only 48px has a curved headband with slanted, round pads. The rest all look the same.

### Steps to Reproduce

- Look at audio-headphones-symbolic sizes on this Github or in Lookbook
- Notice that 48px is different from all of them.

### Expected Behavior

That they would all look the same. Personally, I think 48px looks nicer than the rest actually and that 48px should be recreated in the other sizes. It also looks closer to it's color variant.

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_