A package's autoloads aren't expunged from Doom's profile init file,
even after that package has been disabled. If a package's autoloads has
side-effects, this can lead to void references/function errors. One such
case is with php-extras, which will try to call
`php-extras-company-setup` after company loads from its autoloads, but
this function naturally won't be loaded if the package is disabled.
This change fixes this, fully expunging orphaned autoloads on `doom
sync`.