Bump incorrect test count

The spurious exit removed in 9365ae5 meant that 7 more tests are now
running.

t/mail/gateway.t

@@ -57,7 +57,7 @@ use strict;
 use warnings;
 
 
-use RT::Test config => 'Set( $UnsafeEmailCommands, 1);', tests => 221, actual_server => 1;
+use RT::Test config => 'Set( $UnsafeEmailCommands, 1);', tests => 228, actual_server => 1;
 my ($baseurl, $m) = RT::Test->started_ok;
 
 use RT::Tickets;