[CSL-56] Fix yet another bug prevBlock vs headerHash bug on BlockStorage
[CSL-56] Fix yet another bug prevBlock vs headerHash bug on BlockStorage

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