[Bug Fix] NPC Armor Upgrade to a slot not handled correctly (#3366)

* [NPC Armor - Bug] NPC upgardes in armor not correct

* Revert "[NPC Armor - Bug] NPC upgardes in armor not correct"

This reverts commit d5a68654a7.

* [NPC item bonuses] Upgrades not processed correctly

* Update loottables.cpp

---------

Co-authored-by: Kinglykrab <kinglykrab@gmail.com>

zone/loottables.cpp

@@ -395,9 +395,15 @@ void NPC::AddLootDrop(
 								foundslot = i;
 							}
 							else {
+								// Unequip old item
+								auto* olditem = GetItem(i);
+
+								olditem->equip_slot = EQ::invslot::SLOT_INVALID;
+
 								equipment[i] = item2->ID;
+
 								foundslot = i;
-								found = true;
+								found     = true;
 							}
 						} // end if ac
 					}