Re: bitbake-setup: sync layers to branch HEAD

Thanks for the hint. I found the error.

To test the ``update`` functionality originally, I additionally used ``--source-overrides`` to pin a certain lock file, which referenced (on purpose) an older commit in the oe-core wrynose branch.
Then, I assumed, by calling ``bitbake-setup update`` this would then sync the layer to the latest upstream HEAD (fast-forward from the older commit to the latest).
However, it seems that the ``bitbake-setup update`` does not work in that combination (if the revs are initially pinned). Which is fine for me.

Thanks for the fast help!