Blender Git Loki

Fix T37688: User Preferences do not load correctly

Issue was caused by from_memory=true passing to wm_homefile_read
in case there's a configuration folder for current blender.

But the thing is, we still might fallback to reading home file
from memory (i.e. in cases there's no startup.blend in config
folder).

In this case we still need to run versioning code for userprefs.