feat(psbt): disable unsafe non-segwit sign warning by default

Set __WARN_UNSAFE_SIGN_NONSEGWIT to false by default to prevent
unnecessary warnings when signing non-segwit inputs.

Issue: BTC-2285

Co-authored-by: llm-git <[email protected]>

Author: davidkaplanbitgo

src/psbt.js

@@ -76,7 +76,7 @@ class Psbt {
       // behavior to not require the previous transaction and instead
       // use a witnessUtxo.
       __UNSAFE_SIGN_NONSEGWIT: true,
-      __WARN_UNSAFE_SIGN_NONSEGWIT: true,
+      __WARN_UNSAFE_SIGN_NONSEGWIT: false,
       __TX_FROM_BUFFER: buf =>
         this.constructor.transactionFromBuffer(buf, this.opts.network),
     };

ts_src/psbt.ts

@@ -150,7 +150,7 @@ export class Psbt {
       // behavior to not require the previous transaction and instead
       // use a witnessUtxo.
       __UNSAFE_SIGN_NONSEGWIT: true,
-      __WARN_UNSAFE_SIGN_NONSEGWIT: true,
+      __WARN_UNSAFE_SIGN_NONSEGWIT: false,
       __TX_FROM_BUFFER: buf =>
         (this.constructor as typeof Psbt).transactionFromBuffer(
           buf,