Allow HA_ACTIVE: True to enable HA mode

[Vasfed]

When something python-like (carvel ytt, ansible etc.) is used in deploying wiki - it is highly likely to have a construction similar to:

      env:
        - name: HA_ACTIVE
          value: #@ str(data.values.replicas > 1)

which produces "True" in config and counter-intuitively does not enable high-availability mode, leading to corresponding issues with caching (page edits not reflected until a lot of refreshes, randomly returning stale pages and so on - because not all workers actually refresh the page cache)

With this simple edit we can significantly decrease user frustration

[NGPixel]

I changed the logic to allow any casing for a string value.

However, if you plan on using Wiki.js in a high-availability environment, regardless of whether the replicas count is 1 or higher, HA_ACTIVE should always be set to true.