plugin_label missing in feedback when TFA setup is canceled

I created a merge request with my proposed resolution.

Needs work for real minor changes, otherwise looks good to me.

Thanks for taking a look at it and for your suggestion. I changed it a little bit so now it should be ready for testing.

Committed to dev.

Thank you for the report and the fix.

Setting needs port as the commit does not appear to cleanly cherry-pick to 2.x and we will want to get it there too.