fix: update antique shops, elephant guns are now reasonably obtainable (

#5786)

Update art_antiques_crafts.json

data/json/itemgroups/art_antiques_crafts.json

@@ -215,6 +215,19 @@
     "entries": [
       { "item": "trex_gun", "prob": 4 },
       { "item": "spiral_stone", "prob": 2 },
+      { "item": "pistol_flintlock", "prob": 3 },
+      { "item": "carbine_flintlock", "prob": 3 },
+      { "item": "rifle_flintlock", "prob": 3 },
+      { "item": "longrifle_flintlock", "prob": 3 },
+      { "item": "shotgun_paper", "prob": 4 },
+      { "group": "antique_medieval_arms", "prob": 20 }
+    ]
+  },
+  {
+    "type": "item_group",
+    "id": "antique_medieval_arms",
+    "subtype": "distribution",
+    "entries": [
       { "item": "cutlass", "prob": 2 },
       { "item": "broadsword", "prob": 2 },
       { "item": "nodachi", "prob": 2 },
@@ -257,11 +270,6 @@
       { "item": "wakizashi_fake", "prob": 4 },
       { "item": "wakizashi_inferior", "prob": 8 },
       { "item": "kris_fake", "prob": 8 },
-      { "item": "pistol_flintlock", "prob": 3 },
-      { "item": "carbine_flintlock", "prob": 3 },
-      { "item": "rifle_flintlock", "prob": 3 },
-      { "item": "longrifle_flintlock", "prob": 3 },
-      { "item": "shotgun_paper", "prob": 4 },
       { "item": "petrified_eye", "prob": 2 },
       { "item": "ji", "prob": 1 },
       { "item": "dao", "prob": 3 },