fix(checkbox): set pointer cursor for checkbox

[devversion]

• Adds the pointer cursor to the whole checkbox layout to also indicate that you can also click on the checkbox container and not only on the label.

Fixes #4185

[tinayuangao]

LGTM

[willshowell]

Should the cursor not revert to default when the checkbox is disabled to indicate it is no longer clickable?

[devversion]

@willshowell It does go back to default if the checkbox is disabled.

[willshowell]

Oops - currently the label cursor doesn't revert back to default and I was basing on that. I see how it works now, thanks!

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