Changing timezone in Settings.pak doesn't do anything

Steps to reproduce:

1. Go to Settings > System
2. Change the timezone to something different
3. Observe no change to the displayed time in top-right corner

Reason:

The Settings app creates a timezone symlink in /tmp/localtime but the correct one should be /etc/localtime.

My comment on the PR is here: https://github.com/LoveRetro/NextUI/commit/b9769705dade9221760f5b38be24ffa024563d0d#r179374834