"Add Category" on Write screen should not appear for users who do not have "manage_categories" cap
|Reported by:||markjaquith||Owned by:||markjaquith|
if a user does not have the "manage_categories" capability, they can attempt to add categories "on the fly" from the Write screen, but they'll get a message saying that they can't. This patch prevents the JS that displays the "add" button and message from even loading for users who lack the capability. Should make the page load faster for them too.