[v4] button cursor pointer

[cuquo]

in v3 buttons have cursor-pointer and in v4 is set to default, not sure if is a known issue

[wongjn]

I believe it is on purpose. If we look at #14061, (which talks about some rule overriding cursor which is no longer needed), we can see it references #8961 and #8962. I believe these could be the reasons why buttons do not have cursor: pointer in preflight in v4.