Remove double hashing in state db access

[junha1]

State DB itself hashes the key before it accesses to TrieDB or TrieDBMut.
So hashing a key before calling DB functions is a redundant job.
There might be other spots with same issue but the only thing I could find was this: https://github.com/CodeChain-io/foundry/blob/ics-poc/state/src/traits.rs#L116

Note that the action_data has same problem, but will be removed soon.

[junha1]

https://gitter.im/CodeChain-io/foundry?at=5e4638479d4c83598b8cc061

[majecty]

We don't need to fix ICS PoC implementation.