Don't hide "Load More" button if infinite scrolling fails to load
If a service is overloaded or otherwise having problems, and the infinite scrolling returns a network error, the "Load More" button at the bottom of the page is removed. This makes it impossible to keep reading without refreshing and scrolling back to where you were (further overloading the server).

Simply not removing the button on a network error would let the user click it to continue reading where they left off. Something like this (barely tested) seems to work, although the section could be reworked to never remove it at all.

[infinitescroll.js.patch.txt](https://github.com/zedeus/nitter/files/6431503/infinitescroll.js.patch.txt)
