ruTorrent: Upgrade to v4.3.6

# ruTorrent v4.3.6
**This hotfix resolves a long standing bug with hardlinks on the autotools plugin. It's highly recommended to upgrade.** If a hardlink already exists (like if a torrent is downloaded twice for instance), it would copy a duplicate of the file somewhere else on the hard drive. This was due to a syntax error with the case statement, causing a file copy operation to intendedly be executed.

## What's Changed
* Fix autotools plugin when hardlink already existst by @stickz in Novik/ruTorrent@6ecbf02

**Full Changelog**: Novik/ruTorrent@v4.3.5...v4.3.6

Dockerfile

@@ -7,8 +7,8 @@ ARG XMLRPC_VERSION=01.58.00
 ARG MKTORRENT_VERSION=v1.1
 ARG GEOIP2_PHPEXT_VERSION=1.3.1
 
-# v4.3.5
-ARG RUTORRENT_VERSION=9bf6e15c4864a71ff9e9ca5ea689fd001931279b
+# v4.3.6
+ARG RUTORRENT_VERSION=31c8d351002fb1bdcd71c0652aa516384d330712
 ARG GEOIP2_RUTORRENT_VERSION=4ff2bde530bb8eef13af84e4413cedea97eda148
 
 # v5.3-0.9.8-0.13.8