ace_cargoUnload wrong _item value

[LupusTheCanine]

Mods (complete and add to the following information):

• Arma 3: irrelevant - ace code issue
• CBA: ` irrelevant - ace code issue
• ACE3: master branch and release

Description:
"ace_cargoUnloaded" eh returns classname instead of an object if the item was added using [classname,vehicle,count] call ace_cargo_fnc_addCargoItem;

Steps to reproduce:

1. create eh to monitor "ace_cargoUnloaded" and display its arguments;
2. add item to cargo using aforementioned command;
3. paradrop the item
4. obvserve classname being returned instead of an object.

Expected behavior:
object to be returned.

Where did the issue occur?

• Dedicated / Self-Hosted Multiplayer / Singleplayer / Editor (Singleplayer) / Editor (Multiplayer) / Virtual Arsenal

Additional context:
Can be statically detected.
dropped object is stored in _itemObject but eh returns _item which can contain classname.

[LupusTheCanine]

I will make a PR shortly to fix the issue and probably add the eh to other instances of cargo unloading.