Update revision slider handle styling

[paulwilde]

As the buttons are getting updated in #31459, it makes sense to also update the .wp-slider .ui-slider-handle used on the Revisions page.

Screenshot attached of the (current) version.

[hugobaeta]

Updates slider handle to match normal buttons new style and makes it slightly larger

[hugobaeta]

Screenshot of update in patch 34220-update-revision-slider-1.diff

[hugobaeta]

@paulwilde - Do you think the change to the gray colors makes sense, or out of scope? (and the only reason I made it slightly bigger was to balance the color change). Easily changeable to the primary button colors. I also haven't tested with color schemes.

[paulwilde]

I think the grey colour makes sense, at least to me.

It's more of a secondary action, whereas the primary action on the page is to "Restore This Autosave".

[hugobaeta]

Updated patch, includes hover, and active states (lacking before), and removed from color schemes scss

[adamsilverstein]

@hugobaeta - this looks really nice, thanks!

Screencasts for the record:

Before:

After, showing the hover and active states:

[melchoyce]

Looks good to me.

[helen]

In 34976:

Revisions: Update slider handle styling.

This brings them in line with updated buttons as done in [34948] for #31459. It also gives it secondary action styling as opposed to primary, as restoring is considered the primary action.

props hugobaeta.
fixes #34220.