Disable output spending guessing
As indicated [here](https://github.com/moneroexamples/onion-monero-blockchain-explorer/issues/261#issuecomment-1040384932) the spending guesses are confusing and they will be even less reliable with the new HF when ring sizes is going to be increased to 16.

Maybe its time to make them disabled by default, to avoid confusion on what these "guesses" are.