Revert commit 1285411b8584 ("config: Fix missing core.user entry")
Revert commit 1285411b8584 ("config: Fix missing core.user entry")

lab commit 1285411b8584 attempted to fix the missing core.user entry in
~/.config/lab.hcl, however, it seems to have caused more problems than
it fixed [1].

I'm reworking the config code and have noticed several other odd issues so
reverting this isn't a major step backward.

Reported-by: Bruno Meneguele <bmeneg@redhat.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>

[1] https://github.com/zaquestion/lab/issues/411

zaquestion/lab,zaquestion/lab