new blead warning exposes bogus arg to sprintf

New warnings are great!  Right?  Well, today they are!

Running the PAUSE test suite exposed a "Redundant argument in sprintf" warning.  We passed the same arguments to sprintf that we passed to a dbh execution, but sprintf didn't want them all, so it was (a) wrong (b) losing data.  I've fixed both problems with `pop`.  Woo!

You're welcome, perl 6!  Don't say I didn't do anything for you… :smile: