Give the HSTV-L an ammo box

Hi! Only certain types of vehicles have ammo boxes:

Tank Destroyers, ATGM carriers (the type mentioned in the stat card, not any vehicle with ATGMs), all SPAA and SAMs, as well as ground vehicles with external rockets and bombs (such as the Calliope, M26 T99, RBT-5, Cromwell V (RP-3), Matilda Hedgehog, Magach Hydra).

Since the HSTV-L is a light tank, it won't get an ammo box.