Dizzy broken for building SD cards with wic

https://bugzilla.yoctoproject.org/show_bug.cgi?id=7114

This bug also impacts dizzy now. Do we have a way to back the offending change out of dizzy while the bug is fixed?

It's partly my fault the report came a week or so after we noticed it in master. Sorry for the delay getting it in the bug tracker.

Philip