Fix db.txId == 0 AssertionDefect by moving stateroot check out of persist #3669
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This fix is related to this issue: #3659
The problem was that the assertions in the Aristo mpt and kvt init_common modules assert that no nested db sessions can be created but when calling persist and supplying a stateroot, nested sessions do get created under certain conditions when using snapshots.
To prevent this scenario from occurring this PR moves the stateroot check outside of the call to persist.