escape @, fix wrong address

tools/badconfigdetector/sendadminmail

@@ -31,7 +31,7 @@ Thanks,
 
 --
 Riseup Listmasters
-listadmins\@lists.riseup.net
+listmaster\@lists.riseup.net
 ";
 
   #&domail;
@@ -42,7 +42,7 @@ listadmins\@lists.riseup.net
 sub domail {
   my $email = Email::Simple->create(
     header => [
-      To      => "$list-admin@lists.riseup.net",
+      To      => "$list-admin\@lists.riseup.net",
       From    => $from,
       Subject => $subject,
     ],