Change the weight allowance of clay pots.

By bumping up the weight allowance slightly, both water and salt water
can have 8 units stored in the pot. Before, they could not.
fixes CleverRaven#52824

data/json/items/tool/cooking.json

@@ -206,7 +206,7 @@
     "material": [ "clay" ],
     "symbol": ")",
     "color": "brown",
-    "pocket_data": [ { "max_contains_volume": "2 L", "max_contains_weight": "2 kg", "watertight": true, "rigid": true } ],
+    "pocket_data": [ { "max_contains_volume": "2 L", "max_contains_weight": "2100 g", "watertight": true, "rigid": true } ],
     "qualities": [ [ "COOK", 3 ], [ "BOIL", 2 ], [ "CONTAIN", 1 ], [ "CHEM", 1 ] ],
     "use_action": [ "HEAT_FOOD" ],
     "flags": [ "ALLOWS_REMOTE_USE" ]