Add back cursor: pointer for .btn-link

[jeffbowen]

232e86d makes total sense but buttons with class .btn-link should still display a cursor.

[patrickhlauke]

I'm split on this. I can see the rationale (it's styled to look like a link, so should have the standard pointer cursor for links), but the same argument could be made in reverse for .btn (it's styled like a button, so a link styled as button should have the default cursor for buttons). deferring to @mdo for decision.

[patrickhlauke]

as an added point: i can see this whole thing confusing users either way. a button styled to look like a link, but without the cursor:pointer, will look strange to some users; a button styled as a link, and even more so when it DOES have cursor:pointer, may lead some users to think they can do things like middle-click to open in new tab, or get a link-specific context menu... (but that's a more fundamental issue with mimicking the look of a link)

[mdo]

Nullified by #25082.