Normalize $reassign in wp_delete_user() to ensure the hooks receive consistent values.

fixes #23057.

Built from https://develop.svn.wordpress.org/trunk@27466


git-svn-id: http://core.svn.wordpress.org/trunk@27311 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove lame debugging. see #23057.

Built from https://develop.svn.wordpress.org/trunk@27467


git-svn-id: http://core.svn.wordpress.org/trunk@27312 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Widgets dashicons update.

props melchoyce, michael-arestad, empireoflight.
see #26936.

Built from https://develop.svn.wordpress.org/trunk@27468


git-svn-id: http://core.svn.wordpress.org/trunk@27313 1a063a9b-81f0-0310-95a4-ce76da25c4cd