[ic] AuthorizeNet.pm minor patch

[John Young]

Interchange 5.1, $string is unused in AuthorizeNet.pm:

--- AuthorizeNet.pm.orig	Thu Sep 11 13:12:56 2003
+++ AuthorizeNet.pm	Fri Apr  2 16:46:54 2004
@@ -428,7 +428,6 @@
          }
          push @query, "$key=$val";
      }
-    my $string = join '&', @query;

  #::logDebug("Authorizenet query: " . ::uneval(\%query));
      $opt->{extra_headers} = { Referer => $referer };