Fix Quicklisp syncing bug

If the versions file is present in the cache, but the db is gone for some
reason, it wouldn't ever recreate the db.
2 jobs for v0.1.0 in 10 minutes and 21 seconds (queued for 7 minutes and 17 seconds)
latest
Status Name Job ID Coverage
  Build
passed build-glibc #1963

00:05:16

passed build-musl #1964

00:05:04