Rot zombie definition incompatible with change in core json

[sdp0et]

After the addition of dissoluted devourer zombies, rot zombies now have an upgrade evolution "into". The replacement and variants in this mod have an "into_group" for their evolution. The game displays an error on load (with similar errors for the _flue and _worms varieties: ERROR : src/monstergenerator.cpp:1099 [void MonsterGenerator::check_monster_definitions() const] both into and into_group defined for monster mon_zombie_rot

from vanilla mon_zombie_rot: "upgrades": { "half_life": 23, "into": "mon_devourer" },

and from PK's: "upgrades": { "half_life": 10, "into_group": "GROUP_ZOMBIE_DECAY" },