use tty6 for installedtest post_fail_hook

Summary:
tty2 is where wayland desktop sessions run. I think it makes
sense to use a high tty for the post_fail_hook, so we know the
lower ones can be used by the tests...

Test Plan:
Run a Workstation post-install test that fails, check
the hook works.

Reviewers: jskladan, garretraziel

Reviewed By: garretraziel

Subscribers: tflink

Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D1003

lib/installedtest.pm

@@ -23,7 +23,7 @@ sub root_console {
 sub post_fail_hook {
     my $self = shift;
 
-    $self->root_console(tty=>2);
+    $self->root_console(tty=>6);
 
     # If /var/tmp/abrt directory isn't empty (ls doesn't return empty string)
     my $vartmp = script_output "ls /var/tmp/abrt";