Fix an error in prismlinks

techendo-pal is using array dereferencing to turn several arguments
into a list when the _action method is called on actions, but this
caused a problem for !prismlinks because it captures part of the
message with a regular expression and that is passed in.

Man what a mess.
Fix the :catchall expression

Using *args in the _action method is making sense to me right now, but I'm
beginning to doubt the utility of breaking up all this code the way I did.