Revert "Add UI for the new stdlib fcc option."

This reverts commit 7b1c55354e9167cdf4e14d44c5aba5ae97beaf41.
This fixes #804

Conflicts:
	defaults/preferences/defaults.js
	locale/en-US/options.dtd
	modules/prefs.js
	modules/stdlib
Properly focus the to: field in quick compose