Rounded card corners need minor tweak

[tooomm]

Webpage: dr4ft.info

Browser: Firefox 87.0

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Background Information

The feature got implemented in https://github.com/dr4fters/dr4ft/pull/1485

Detailed Description

For black border cards there is no issue. But with white border sets, like e.g. 7th Edition, there is still a small black line displayed.

Further Information

Closeup: