wizard: make sure terminate is always called

gui/qt/__init__.py

@@ -173,6 +173,7 @@ class ElectrumGui:
                 storage = WalletStorage(path)
                 wizard = InstallWizard(self.config, self.app, self.plugins, storage)
                 wallet = wizard.run_and_get_wallet()
+                wizard.terminate()
                 if not wallet:
                     return
                 wallet.start_threads(self.daemon.network)

gui/qt/installwizard.py

@@ -251,7 +251,6 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             self.storage.upgrade()
             self.show_warning(_('Your wallet was upgraded successfully'))
             self.wallet = Wallet(self.storage)
-            self.terminate()
             return self.wallet
 
         action = self.storage.get_action()
@@ -271,7 +270,6 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
             return self.wallet
 
         self.wallet = Wallet(self.storage)
-        self.terminate()
         return self.wallet