Due to inconsistencies in the way browsers handle Exif orientation data,
if a user manually rotates an image within WordPress, set the Exif orientation to
the default (1) so that the image displays with the same rotation/flip in every browser.
Props sanchothefat, triplejumper12, joemcgill, azaozz, markoheijnen, mikeschroder.
See #14459.
Fixes#37140.
git-svn-id: https://develop.svn.wordpress.org/trunk@40123 602fd350-edb4-49c9-b593-d223f7449a82
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