Functional tests: Resolve NoAlertPresentException

We were getting a NoAlertPresentException due to new behavior in
geckodriver [0] where interacting with the driver closes the modal.
Thus, we do not need to explicitly accept the modal here.

[0] mozilla/geckodriver#1171

securedrop/tests/functional/journalist_navigation_steps.py

@@ -699,8 +699,6 @@ def _visit_edit_secret(self, type):
         reset_button = self.driver.find_elements_by_css_selector(
             '#button-reset-two-factor-' + type)[0]
         reset_button.click()
-        self._alert_accept()
-        time.sleep(self.sleep_time)
 
     def _visit_edit_hotp_secret(self):
         self._visit_edit_secret('hotp')