protocols/snap/sync_test: each peer have a different account trie #628
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Reference: ethereum/go-ethereum#25532
Before PBSS, in the snap sync tests, there are no changes to the account trie, so it is acceptable for the peers to use the same account trie. However, PBSS added a tracer that also traces the accessed nodes, leading to the race condition.
This PR is to assign each peer with a copy of the account trie.