Restores pre-U183 models for FBI and GenSec tans that had no head torch

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Files:

units/payday2/characters/ene_city_heavy_g36/ene_city_heavy_g36.model
units/payday2/characters/ene_city_heavy_r870/ene_city_heavy_r870.model
units/payday2/characters/ene_fbi_heavy_1/ene_fbi_heavy_1.model