fix: optimization: PVS-Studio warning V832

It's better to use '= default;' syntax instead of empty constructor and destructor body.
Using '= default;' can help the compiler generate more optimal code.

Reported by: PVS-Studio

Signed-off-by: Vyacheslav Ivanov <islavaivanov76@gmail.com>

src/items/Inventories.cpp

@@ -8,8 +8,7 @@
 Inventories::Inventories(Level& level) : level(level) {
 }
 
-Inventories::~Inventories() {
-}
+Inventories::~Inventories() = default;
 
 std::shared_ptr<Inventory> Inventories::create(size_t size) {
     int64_t id = level.getWorld()->getNextInventoryId();