fix ammo effect that should be a flag

Author: Fris0uman

data/json/items/ammo.json

@@ -572,7 +572,8 @@
     "loudness": 0,
     "to_hit": { "grip": "solid", "length": "hand", "surface": "any", "balance": "neutral" },
     "recovery_chance": 99,
-    "effects": [ "NEVER_MISFIRES", "NON_FOULING", "ALLOWS_BODY_BLOCK" ],
+    "effects": [ "NEVER_MISFIRES", "NON_FOULING" ],
+    "flags": [ "ALLOWS_BODY_BLOCK" ],
     "qualities": [ [ "HAMMER", 1 ] ],
     "melee_damage": { "bash": 7 },
     "thrown_damage": { "damage_type": "bash", "amount": 7 }