Add a PRINTF statement or error code to every SW_INCORRECT_DATA

[kewde]

Debugging issues with PSBTs can be painful, SW_INCORRECT_DATA is essentially a blackhole that tells you nothing about what went wrong.

• it would be greatly appreciated if debug firmware at least has a PRINTF statement prepended to indicate why it's sending this error back.
• even better would be an error code through SEND_SW_EC - that way you don't even need debug firmware to debug any issue 👍

PS: does ledger publish debug firmware for the bitcoin app?