Fix invalid item Documents preventing all physical item updates

[In3luki]

The handleHPChange function creates an actor clone on every physical item update even when the HP did not change. The observed error happens when the actor clone is created with an invalid item source as Actor#toObject still includes the source of invalid embedded documents. The function is called from _preUpdate so a thrown error prevents the update from going through.

[stwlam]

Just this part

[In3luki]

The error happens on line 275 when the new actor is created from the actorSource that may contain invalid item data.
itemClone on 276 is then referencing actorClone and itemClone itself is referenced on line 287.
I could make actorClone an IIFE to make the block smaller:

    const actorClone = ((): ActorPF2e | null => {
        try {
            return actorSource ? new ActorProxyPF2e(actorSource) : null;
        } catch {}
        return null;
    })();

Edit: Done that.