Only set fresh_site during an actual fresh install.

props westonruter.
fixes #38533.


git-svn-id: https://develop.svn.wordpress.org/trunk@39076 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/schema.php

@@ -516,9 +516,6 @@ function populate_options() {
 	// 4.4.0
 	'medium_large_size_w' => 768,
 	'medium_large_size_h' => 0,
-
-	// 4.7.0
-	'fresh_site' => 1,
 	);
 
 	// 3.3