Regression in PSBT.sign_with

[ghost]

I ran into a regression in the PSBT.sign_with function.

Before the taproot changes, if you relied on the default value for the sighash parameter and tried to sign an input where inp.sighhash_type = SIGHASH.ALL, this would work as expected and sign the input because the default value for sighash would also be SIGHASH.ALL.

Now, if an input with inp.sighash_type = SIGHASH.ALL is seen, it will be compared to sighash which will be SIGHASH.DEFAULT, resulting in a continue that skips signing the input.