Always maximize window in selenium tests.

There are random times when the input fields cannot be found, and this
seems to help.

guiTests/guiTest.py

@@ -35,7 +35,6 @@ else:
     options = Options()
     options.set_headless(headless=True)
     driver = webdriver.Firefox(profile, firefox_options=options)
-    driver.maximize_window()
 
 
 def write_random_file(size, filename):
@@ -90,6 +89,7 @@ DIRECT_RESTORE_FOLDER = os.path.abspath("duplicati_gui_test_direct_restore")
 time.sleep(5)
 
 driver.implicitly_wait(10)
+driver.maximize_window()
 driver.get("http://localhost:8200/ngax/index.html")
 
 if "Duplicati" not in driver.title: