keystore.sign_message: add optional script_type argument

this is used by trezor
(and also by bitbox02, which was using a workaround previously)

fixes https://github.com/spesmilo/electrum/issues/7670

electrum/plugins/trezor/clientbase.py

@@ -228,7 +228,7 @@ class TrezorClientBase(HardwareClientBase, Logger):
                 multisig=multisig)
 
     @runs_in_hwd_thread
-    def sign_message(self, address_str, message):
+    def sign_message(self, address_str, message, *, script_type):
         coin_name = self.plugin.get_coin_name()
         address_n = parse_path(address_str)
         with self.run_flow():
@@ -236,7 +236,9 @@ class TrezorClientBase(HardwareClientBase, Logger):
                 self.client,
                 coin_name,
                 address_n,
-                message)
+                message,
+                script_type=script_type,
+                no_script_type=True)
 
     @runs_in_hwd_thread
     def recover_device(self, recovery_type, *args, **kwargs):

electrum/plugins/trezor/trezor.py

@@ -77,10 +77,11 @@ class TrezorKeyStore(Hardware_KeyStore):
     def decrypt_message(self, sequence, message, password):
         raise UserFacingException(_('Encryption and decryption are not implemented by {}').format(self.device))
 
-    def sign_message(self, sequence, message, password):
+    def sign_message(self, sequence, message, password, *, script_type=None):
         client = self.get_client()
         address_path = self.get_derivation_prefix() + "/%d/%d"%sequence
-        msg_sig = client.sign_message(address_path, message)
+        script_type = self.plugin.get_trezor_input_script_type(script_type)
+        msg_sig = client.sign_message(address_path, message, script_type=script_type)
         return msg_sig.signature
 
     def sign_transaction(self, tx, password):