Adjust border-radius from 4 px to 10 px for podcast art

[linkinparkrulz]

I changed the border radius in two places:

• one was a global variable that covered all podcast art instances
• the other was an a tag for super chapters

The reason for the change is that, in my opinion, it softens the look of the app just slightly and adds more polish to the art.

[linkinparkrulz]

Oh I thought the exact same thing and thought I discluded them. I will remember to double check next time. Sorry boss 🙏