David A. Kennedy ebe736af3f Twenty Seventeen: Ensure the use of proper image size for custom header image
The `sizes` attribute was calculated incorrectly, resulting in the browser downloading the wrong resource. This filters the attribute to correct that.

Before the filter, the `img` contained:
`sizes="(max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px"`

And after:
`sizes="100vw"`

Props joemcgill, transl8or.

Fixes #38847.


git-svn-id: https://develop.svn.wordpress.org/trunk@39291 602fd350-edb4-49c9-b593-d223f7449a82
2016-11-18 18:42:16 +00:00
2016-09-06 18:12:09 +00:00
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