fix: alter andesite limits

Reflects that andesite does not require andesite to create.

oregen-manager.lua

@@ -58,6 +58,10 @@ local LIMIT_EXCEPTIONS = {
         lower = 64,
         upper = 2 * 64,
     },
+    ["minecraft:andesite"] = {
+        lower = 0,
+        upper = 2 * 64,
+    },
 }
 
 -- if these exist, they will be used up