Describe the bug
It feels odd to see the button border radius slider without an initial value, or to have a modified value disappear when hitting the Reset button. Is there any reason why we wouldn't want the 5 value displayed?

To reproduce
Steps to reproduce the behavior:

1. Add a button block.
2. Open the sidebar and Border Settings.
3. Notice the empty value for the slider.

Expected behavior
I'd expect to see the initial value of 5.

Screenshots