fix: depotchest memory leak

[lyuz1n]

Pull Request Prelude

• [x] I have followed proper The Forgotten Server code styling.
• [x] I have read and understood the contribution guidelines before making this PR.
• [x] I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

items on depot cannot destroy after player logout. after some relogins with around 100k items on depot...

BEFORE FIX:

AFTER FIX:

[nekiro]

https://github.com/otland/forgottenserver/pull/3423 https://github.com/otland/forgottenserver/pull/3452

[ranisalt]

@nekiro is right, if you're going to change to a shared ptr, you must change it everywhere or you will get nasty double frees