small fix: wait a sec between clicks of 'Done' in no_swap

I've seen no_swap fail several times with the 'Click for details
or press Done again to continue.' message showing (e.g. job
967 on BOS). I think this is just because sometimes we try and
click Done too fast, so introduce a 1-second sleep between Done
clicks to try and solve that.

tests/disk_custom_no_swap.pm

@@ -14,6 +14,8 @@ sub run {
     $self->custom_delete_part('swap');
     assert_and_click "anaconda_spoke_done";
     # Deleting swap shows a warning and requires a second click to confirm
+    # Wait a sec first, otherwise sometimes we click too fast
+    sleep 1;
     assert_and_click "anaconda_spoke_done";
     assert_and_click "anaconda_part_accept_changes";