Decomm EXEC_DIRECTLY

[itzg]

Discussing in https://github.com/itzg/docker-minecraft-server/discussions/3680#discussioncomment-14568159 it has become apparent that Unraid's app template sets this to true by default. It's a dangerous default since it prevents graceful shutdown of the server when the container is stopped.

It turns out the original reason for that variable, ensuring colorized logs, was solved elsewhere in the runner.

The conditonal that uses this variable can just be removed.