Comptool.py - replace missing leading zero from blockhash
Comptool.py - replace missing leading zero from blockhash

When a blockhash begins with a zero, the zero will be missing when
calling block.sha256.  We need to replace those zero's before
doing our blockhash comparison.

marcusdiaz/BitcoinUnlimited,cddjr/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,Justaphf/BitcoinUnlimited,Bitcoin-com/BUcash,BTCfork/hardfork_prototype_1_mvf-bu,AllanDoensen/BitcoinUnlimited,arruah/ensocoin,BitcoinUnlimited/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BTCfork/hardfork_prototype_1_mvf-bu,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,marcusdiaz/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,krzysztofwos/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,Justaphf/BitcoinUnlimited,Bitcoin-com/BUcash,arruah/ensocoin,Bitcoin-com/BUcash,marcusdiaz/BitcoinUnlimited,cddjr/BitcoinUnlimited,arruah/ensocoin,BitcoinUnlimited/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,arruah/ensocoin,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,BitcoinUnlimited/BitcoinUnlimited,cddjr/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,arruah/ensocoin,cddjr/BitcoinUnlimited,ftrader-bitcoinunlimited/hardfork_prototype_1_mvf-bu,cddjr/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,krzysztofwos/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,Bitcoin-com/BUcash,Justaphf/BitcoinUnlimited,arruah/ensocoin,krzysztofwos/BitcoinUnlimited,Bitcoin-com/BUcash,Justaphf/BitcoinUnlimited,BTCfork/hardfork_prototype_1_mvf-bu,Justaphf/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited,BitcoinUnlimited/BitcoinUnlimited,marcusdiaz/BitcoinUnlimited,AllanDoensen/BitcoinUnlimited