Remove Railgun Fouling (#74250)

* Remove Railgun Fouling

* Removed "bad cycling"

Spent casings can't be stuck in a chamber if there's no casing.

* Update 12mm.json

Re-run checks.

data/json/items/gun/12mm.json

@@ -30,7 +30,7 @@
       [ "stock accessory", 2 ],
       [ "underbarrel", 1 ]
     ],
-    "flags": [ "NEVER_JAMS", "USE_UPS" ],
+    "flags": [ "NEVER_JAMS", "NON_FOULING", "NEEDS_NO_LUBE", "USE_UPS" ],
     "pocket_data": [ { "pocket_type": "MAGAZINE_WELL", "magazine_well": "250 ml", "item_restriction": [ "hk_g80mag" ] } ],
     "melee_damage": { "bash": 12 }
   }