base-files: fix zoneinfo support

base-files: fix zoneinfo support

The system init script currently sets /tmp/localinfo when zoneinfo is
populated. However, zoneinfo has spaces in it whereas the actual files
have _ instead of spaces. This made the if condition never return true.

Example failure when removing the if condition:

/tmp/localtime -> /usr/share/zoneinfo/America/Los Angeles

This file does not exist. America/Los_Angeles does.

Ran through shfmt -w -ci -bn -sr -s

Signed-off-by: Rosen Penev <rosenp@gmail.com>
(cherry picked from commit 8af62ede189aa504135db05474d34c9f8a1ed35d)