Fix account note border radius (#14251)

app/javascript/styles/mastodon/components.scss

@@ -6627,7 +6627,6 @@ noscript {
     padding: 15px;
     padding-bottom: 10px;
     color: $primary-text-color;
-    border-radius: 4px;
     font-size: 14px;
     font-weight: 400;
     border-bottom: 1px solid lighten($ui-base-color, 12%);