bokftui: fix self-copy that emptied the username on password loginv0.1.23

try_login is called with a->username as the user; snprintf with
overlapping source and destination is undefined and produced "" on
glibc, so config_save wrote 'user=' and later reloads could not
auto-login. Copy through a temporary, carry BOKFD_USER on reload and
never persist an empty user.

0 files changed, 0 insertions, 0 deletions