Add a bit of sleep so the guide blocking sticks

Author: nirvn

test/spix/smoke_test.py

@@ -100,6 +100,8 @@ def test_start_app(app, screenshot_path, extra, process_alive):
 
     app.invokeMethod("mainWindow/toursController", "blockGuides", [])
 
+    time.sleep(1)
+
     app.takeScreenshot("mainWindow", os.path.join(screenshot_path, "startup.png"))
     assert process_alive()
     extra.append(extras.html('<img src="images/startup.png"/>'))