Use TORSOCKS_* instead of TSOCKS_*

I noticed that parcimonie.sh wouldn't work on my Debian machine, this PR fixes this. This may be an incompatible change on systems where the current version isn't broken. If this is a concern, it may be an option to just set both set of variables to the same value.

torsocks used `TORSOCKS_*` as environment variables since before version 1.0 was even released, according to [this commit](https://gitweb.torproject.org/torsocks.git/commit/23818494dcaad8339445f4f6ac948ede5a72b8e4).