Fix bug in BK trigger for sending changes to InnoDB devs.

BitKeeper/triggers/triggers-lib.pl:
  Fix bug in innodb_send_changes_mail() that always displayed
  details for the most recent changeset (-r+) instead of the
  $cset function argument.

BitKeeper/triggers/triggers-lib.pl

@@ -345,10 +345,10 @@ changes are in a clone of a $mysql_version tree.
 EOF
   }
   print SENDMAIL "\n";
-  print SENDMAIL qx(bk changes -r+);
+  print SENDMAIL qx(bk changes -r'$cset');
   print SENDMAIL "$description";
   print SENDMAIL "The complete ChangeSet diffs follow.\n\n";
-  print SENDMAIL qx(bk rset -r+ -ah | bk gnupatch -h -dup -T);
+  print SENDMAIL qx(bk rset -r'$cset' -ah | bk gnupatch -h -dup -T);
 
   close_or_warn(SENDMAIL, "$sendmail -t")
     or return undef;