pack-redundant: delete redundant code

The objects in alt-odb are removed from `all_objects` twice in `load_all_objects`
and `scan_alt_odb_packs`, remove it from the later function.

Signed-off-by: Sun Chao <sunchao9@huawei.com>
Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/pack-redundant.c

@@ -545,7 +545,6 @@ static void scan_alt_odb_packs(void)
 							alt->all_objects);
 			local = local->next;
 		}
-		llist_sorted_difference_inplace(all_objects, alt->all_objects);
 		alt = alt->next;
 	}
 }