parser: Support WIF with BIP32 origin

This uncovered a bug in rust-miniscript causing the origin information
to be lost, so it will not actually work until the fix is merged:
rust-bitcoin/rust-miniscript#753

src/parser/grammar.lalrpop

@@ -35,7 +35,7 @@ match {
   r"(\[[a-fA-F0-9]{8}(/\d+['h]?)*\])?[xt]pub[0-9a-zA-Z]{100,120}" => XPUB,
   r"(\[[a-fA-F0-9]{8}(/\d+['h]?)*\])?[xt]prv[0-9a-zA-Z]{100,120}" => XPRV,
   r"\[[a-fA-F0-9]{8}(/\d+['h]?)*\]([a-fA-F0-9]{64}|[a-fA-F0-9]{66})" => SINGLE_PK_ORIG, // single pubkey with BIP32 origin
-  r"[KLc][1-9A-HJ-NP-Za-km-z]{51}|[59][1-9A-HJ-NP-Za-km-z]{50}" => WIF,
+  r"(\[[a-fA-F0-9]{8}(/\d+['h]?)*\])?([KLc][1-9A-HJ-NP-Za-km-z]{51}|[59][1-9A-HJ-NP-Za-km-z]{50})" => WIF,
   _,
 }