[CSL-508] Improve `MonadState` instance for `MemState.Holder`
[CSL-508] Improve `MonadState` instance for `MemState.Holder`

input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype