Fixed item expiration SQL queries

[azalty]

Thanks to #146 for reporting an SQL error

This patch fixes the following error:

[store.smx] SQL error happened.
Query: delete `store_items`, `store_equipment`from `store_items`, `store_equipment` where (store_items.unique_id = store_equipment.unique_id) and store_items.date_of_expiration<>0 and store_items.date_of_expiration<1676067429
Error: near "store_items": syntax error

It should also fix items not properly expiring as:

• On initial DB connection, only unequipped expired items where deleted
• On future map changes, only equipped expired items where deleted

In both cases, it should now delete both equipped and unequipped expired items

Please note that my work might need more optimization. We could use a function to clear the DB since code is reused in 2 different locations.

❌ Didn't try to compile ❌ Didn't test in game

[nuclearsilo583]

thanks