Bugfix: AIM: insert items into container in corpse

* Prevents segfault in AIM when inserting items into a toplevel container that is carried by a corpse.
* How to reproduce issue being resolved:
	1. Stand adjacent to corpse
	2. Corpse is wearing "garter belt"
	3. Enter AIM, have "all" on left and "inventory" on right
	4. Navigate to "garter belt" on left and press `c` to open it as container
	5. Switch to right AIM pane and navigate to an item in your inventory, for example "matchbook"
	6. Press enter to move "matchbook" into "garter belt"
	7. Segfault

src/advanced_inv_pane.cpp

@@ -260,8 +260,8 @@ void advanced_inventory_pane::add_items_from_area( advanced_inv_area &square,
                     if( it->is_corpse() ) {
                         for( item *loot : it->all_items_top( item_pocket::pocket_type::CONTAINER ) ) {
                             if( !is_filtered( *loot ) ) {
-                                advanced_inv_listitem aim_item( item_location( loc_cursor, loot ), 0, 1, square.id,
-                                                                is_in_vehicle );
+                                advanced_inv_listitem aim_item( item_location( item_location( loc_cursor, it ), loot ),
+                                                                0, 1, square.id, is_in_vehicle );
                                 square.volume += aim_item.volume;
                                 square.weight += aim_item.weight;
                                 items.push_back( aim_item );