Using back swipe gesture in FAQ makes Back Button go out of sync

When presenting the FAQ via `Helpshift.showFAQs(withConfig: nil)`, and the user taps on a support article, then wants to go back, it's been observed that the Back Button will not update correctly if the user chooses to _swipe_ to go back rather than _tapping_ the back button.

If the user _taps_ on the back button, they reach the previous screen as intended, and the back button turns into a Close button as intended.
If the user _swipes_ to go back, they reach the previous screen as intended, but the back button remains as a back button, and tapping on it does nothing.