Spawning a Warden gives the player a darkness effect even if the player is in creative

Summary:
Spawning a Warden gives the player a darkness effect even if the player is in creative. This breaks parity with Java versions.

Steps to reproduce:

1. Switch to creative game mode.

2. Spawn a Warden.

Observed results:
You were immediately given the darkness effect.

Expected results:
In creative game mode, players will not be given the darkness effect.