fix: nerf goblin encampment charcoal reserves (#62621)

so one of the goblin encampment chunks makes calls to some
itemgroups containing this line:

{ "item": "charcoal", "count": [ 20, 75 ], "prob": 20 },

aka give me some charcoal items, but like each has 50 charges so
spawn 50 charges worth times 20 to 75 charcoal, a few.

change it so it's less, way less, still a fair amount 10 to 50 charges
times 2 to 5, I like this cause it'll spawn a very randomized amount
each time

Co-authored-by: casswedson <[email protected]>

data/mods/Magiclysm/itemgroups/itemgroups.json

@@ -1385,7 +1385,7 @@
     "id": "wood_fuel",
     "//": "fuel for a cookpot",
     "items": [
-      { "item": "charcoal", "count": [ 20, 75 ], "prob": 20 },
+      { "item": "charcoal", "count": [ 2, 5 ], "charges": [ 10, 50 ], "prob": 20 },
       { "item": "log", "count": [ 1, 3 ], "prob": 40 },
       { "item": "2x4", "count": [ 4, 8 ], "prob": 40 }
     ]