apps/btc: remmove unused #define
#include <wally_script.h>
#define BTC_PURPOSE_P2PKH (44 + BIP32_INITIAL_HARDENED_CHILD)
-#define BTC_PURPOSE_MULTISIG (48 + BIP32_INITIAL_HARDENED_CHILD)
#define BTC_PURPOSE_P2WPKH_P2SH (49 + BIP32_INITIAL_HARDENED_CHILD)
#define BTC_PURPOSE_P2WPKH (84 + BIP32_INITIAL_HARDENED_CHILD)
