[R4R] fix: Incorrect merkle root issue when enabling pipecommit with miner

[j75689]

Description

1. Trie data is incorrect when enabling pipecommit with miner.

2. Account root hash is incorrect when doing `statedb.CorrectAccountsRoot `.

Rationale

1. 1. Because the parlia consensus will call the system contract in FinalizeAndAssemble, and change the state of the world. But before that, the statedb is copied, but this copied statedb will not be used when writing blocks, resulting in incorrect writing of the world state.
2. 1. When account root is an empty hash, the correct emptyhash value is not assigned.

Example

N/A

Changes

Notable changes:

• copy the statedb after FinalizeAndAssemble

[forcodedancing]

Cool. So we need to put the env copy code after FinalizeAndAssemble to make sure statdb is corrected all places.