This fixes an issue introduced in [44166] where the `$groupby` variable was inserted too low in the `get_site_ids()` function while merging [43832] into `trunk`. The merged location did not account for a new conditional statement that existed only in `trunk`, and would have resulted in values assigned to `$groupby` being erased in certain scenarios.
Props spacedmonkey.
See #44416.
Fixes#45582.
git-svn-id: https://develop.svn.wordpress.org/trunk@44186 602fd350-edb4-49c9-b593-d223f7449a82