Chickenwalker drop modifications (#35713)

Since chicken walkers explode I didn't want the player to get a complete body with all parts working and salvageable, but there were several items that are required for an existing rebuild a chicken walker recipe that don't drop anyone under any conditions. So now there is a chance they can drop.

data/json/itemgroups/item_groups.json

@@ -5794,7 +5794,24 @@
   {
     "type": "item_group",
     "id": "chickenbot",
-    "items": [ [ "9mm", 8 ], [ "kevlar_plate", 10 ], [ "ceramic_armor", 15 ], [ "alloy_plate", 10 ], [ "robot_controls", 5 ] ]
+    "items": [
+      [ "robot_controls", 5 ],
+      [ "ai_module", 5 ],
+      [ "sensor_module", 5 ],
+      [ "memory_module", 5 ],
+      [ "pathfinding_module", 5 ],
+      [ "identification_module", 5 ],
+      [ "reverse_jointed_legs", 40 ],
+      [ "chickenbot_chassis", 40 ],
+      [ "targeting_module", 5 ],
+      [ "gun_module", 30 ],
+      [ "mark19", 5 ],
+      [ "tazer", 5 ],
+      [ "m249", 5 ],
+      [ "storage_battery", 5 ],
+      [ "plut_cell", 5 ],
+      [ "mil_plate", 2 ]
+    ]
   },
   {
     "type": "item_group",

data/json/monsters/monsters.json

@@ -767,7 +767,7 @@
     "starting_ammo": { "40mm_frag": 100, "556": 1000 },
     "path_settings": { "max_dist": 10 },
     "special_attacks": [ [ "CHICKENBOT", 4 ] ],
-    "death_drops": { "groups": [ [ "robots", 4 ], [ "chickenbot", 1 ] ] },
+    "death_drops": { "groups": [ [ "robots", 4 ], [ "chickenbot", 4, 6 ] ] },
     "death_function": [ "EXPLODE" ],
     "flags": [ "SEES", "HEARS", "BASHES", "NO_BREATHE", "ELECTRONIC", "PRIORITIZE_TARGETS" ]
   },