[actions.pm] construct twigilled variables right
[actions.pm] construct twigilled variables right

In <http://rt.perl.org/rt3/Ticket/Display.html?id=67846>, :$.bar
turned into $1bar. The <twigil> subrule was called with a
postfix:<?>, turning its submatch into an array.  The colonpair
action method now takes this into account. This is a first step
towards fixing #67846. Rakudo still doesn't conform to the semantics
explained in L<S06/Attributive parameters>, but now it at least has a
chance.

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