fix(utils): fix some glitch in utils.table.sum

gamecore/utils/table.lua

@@ -38,11 +38,11 @@ end
 
 function Table.sum(table)
   local sum = 0
-  for _, v in kpairs(table) do
+  for _, v in pairs(table) do
     sum = sum + v
   end
 
-  return v
+  return sum
 end
 
 function Table.average(table)