Teach scss-lint that `border: 0` > `border: none`

Since these two styles are behaviorally equivalent, the shorter is
preferred.

Change-Id: I1fdebdbd2180b40959472eeb123f20c42ad5307b
Reviewed-on: https://gerrit.causes.com/22669
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Aiden Scandella <aiden@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>