fix(explorer): make sure txHash always has the 0x prefix

[alfetopito]

Summary

Make sure txHash on transaction view always has the 0x prefix

To Test

1. Search for a transaction hash without the 0x prefix
   • Should load as usual
   • Link to etherscan should work

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[alfetopito]

I works!

But now I have a separate quesiton: why search for a TX hash without 0x works fine while it does not for an order id? :)

Historical reasons (I don't know, basically)