fix: consistent sort order in sortPlugin

[jaem0629]

checkOrder used original key order, but fixOrder sorted them alphabetically.

For { "name": "test", "zebra": "z", "apple": "a" }:

• check: ["name", "zebra", "apple"] → pass
• fix: ["name", "apple", "zebra"] → different

Moved sortedRestKeys outside if block so both use the same sorted order.

[ho991217]

LGTM!