[CSE-42] Fix sumCoinOfInputsOutputs
[CSE-42] Fix sumCoinOfInputsOutputs

as suggested by @ksaric

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