Make fasttoggle_comment and modr8 depend on fasttoggle_node.

Make comment and modr8 support depend on fasttoggle_node. They
could theoretically be separated, but it would require some
duplication of code. The user can always just not enable node
options they don't want.

Signed-off-by: Nigel Cunningham <nigel@nigelcunningham.com.au>