There is an updated version of Facebook available in the market. This update will get rid of the themed version of Facebook that comes with SS-4.6.
I have updated the newer version to match if anyone is interested. I didn't change the layout of the new version at all, just updated the icons and colors.
If you have already installed the update from the market, you will need to uninstall it in order to theme it.
Go to Settings > Applications > Manage Applications > Facebook > Uninstall Updates.
It will ask you to log back into Facebook after the install but it should retain all of your settings.
Here is the link for the version that is included with 4.6 if anyone needs it