fix(es_extended/server/functions): persist items added via AddItems

MySQL.prepare.await batch mode expects an array of positional parameter
arrays, but toInsert holds keyed tables, so the placeholders received no
values and the INSERT silently did nothing. Items still showed up in-game
because ESX.Items was populated from the keyed tables, but nothing was
written to the items table. Build a positional parameters array for the
prepared insert.

Closes #1768

[core]/es_extended/server/functions.lua

@@ -799,9 +799,15 @@ if not Config.CustomInventory then
         end
 
         if #toInsert > 0 then
+            local parameters = {}
+            for i = 1, #toInsert do
+                local row = toInsert[i]
+                parameters[i] = { row.name, row.label, row.weight, row.rare, row.canRemove }
+            end
+
             MySQL.prepare.await(
             "INSERT IGNORE INTO `items` (`name`, `label`, `weight`, `rare`, `can_remove`) VALUES (?, ?, ?, ?, ?)",
-                toInsert)
+                parameters)
 
             for i = 1, #toInsert do
                 local row = toInsert[i]