Fix rounded corners in edit row modal

The row edit modal is now missing rounded corners on the right side:

From Bram:

If the outside doesn’t have overflow: hidden;, and is equally high as the outside, the sharp corners will go over the rounded corners of the parent. I don’t think the outside should have overflow: hidden; in this case though. That will cause some other problems, but if the inside will have matches rounded corners, then it should be okay.