Disable the 8) smiley as it breaks regular text more than all of the others....

Disable the 8) smiley as it breaks regular text more than all of the others. props sksmatt. fixes #17122.

git-svn-id: https://core.svn.wordpress.org/trunk@19613 1a063a9b-81f0-0310-95a4-ce76da25c4cd