tdesktop: 1.8.2 -> 1.8.4

I didn't include the additional sed patching from Arch [0] as the build
ran fine without it and I didn't notice any issues at runtime.
The fixes for "ranges::sized_iterator_range" might only be required on
Arch due to other library versions.

[0]: https://git.archlinux.org/svntogit/community.git/commit/trunk?h=packages/telegram-desktop&id=4c2b019d7f3d7f399ffa3d94cf6eaddfe9972792