Fix assert_and_click call in realmd_join_cockpit

This was just doing something silly before, but with recent
os-autoinst having function signatures, it actually causes the
test to fail because '5' isn't a sane value for the argument
this was setting before. Fix it to set the timeout, as it was
trying to do all along.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/realmd_join_cockpit.pm

@@ -42,7 +42,7 @@ sub run {
     # didn't work, try again a few times
     my $count = 4;
     while ($count > 0) {
-        assert_and_click "cockpit_join_domain_button", 5;
+        assert_and_click "cockpit_join_domain_button", timeout=>5;
         last if (check_screen "cockpit_join_domain", 30);
     }
     assert_screen "cockpit_join_domain";