Level 20: auto alignment

[alexanderpas]

Both grid-template-columns: 50% 50%; and grid-template-columns: 1fr 1fr; are accepted as valid answers, but grid-template-columns: auto auto; is not considered a valid answer, when the result is exactly the same.

grid-template-columns: auto auto; should also be a valid answer.

[thomaspark]

Thanks @alexanderpas for the bug report. Pushing a fix for this now.