[2021] Sniper droid in tier 4 of GC

The Sniper Droid will only be spawned in Tier 4 and higher as per the enemy modifier "Malicious Minions". Since GBA has no zeta on his unique ability in Tier 4 a sniper droid is spawned instead of the Geo Brute. This won't happen in Tier 5 and higher since the GBA has its unique zetaed there.