wizard: fix decryption of hw wallet files

see #5174

electrum/gui/qt/installwizard.py

@@ -270,7 +270,7 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
                         return
                 elif self.temp_storage.is_encrypted_with_hw_device():
                     try:
-                        self.run('choose_hw_device', HWD_SETUP_DECRYPT_WALLET, self.temp_storage)
+                        self.run('choose_hw_device', HWD_SETUP_DECRYPT_WALLET, storage=self.temp_storage)
                     except InvalidPassword as e:
                         QMessageBox.information(
                             None, _('Error'),

electrum/storage.py

@@ -119,7 +119,7 @@ class WalletStorage(PrintError):
             if encryption is disabled completely (self.is_encrypted() == False),
             or if encryption is enabled but the contents have already been decrypted.
         """
-        return bool(self.data)
+        return bool(self.db.data)
 
     def is_encrypted(self):
         """Return if storage encryption is currently enabled."""