uncomment TIME_ZONE in env_sample.hjson

[lsloan]

Problem

I was helping Chris Lalande of Wisconsin understand the differences between various timestamps in her school's deployment of MyLA. It turns out that although her school is in the Central time zone, MyLA's admin interface is showing times in the Eastern time zone (EDT, specifically). She's not confirmed it yet, but I think because the TIME_ZONE line in env_sample.hjson is commented out, they didn't set their local time zone in Wisconsin's deployment.

Solution

To avoid admins forgetting to set their time zone, TIME_ZONE should not be commented out in sample config file.