We had old code that tried to update MEDIA_ROOT when the directory
moved. However, this code was updating the wrong variable (setting
MEDIA_ROOT to the static directory), and never tried to actually fix
STATIC_ROOT. This was clearly wrong, and has been for some time.

We now properly update the two variables based on their respective paths
and settings.

I hit this issue after moving my source tree around. This fixed it,

setting the correct paths for both variables to their correct new values.