Revert Debian package specific change.

This is required so sshuttle can be run from git repository.

The way the Debian package is created is non-standard, and probably
needs redoing anyway.

src/sshuttle

@@ -4,8 +4,7 @@ for i in 1 2 3 4 5 6 7 8 9 10; do
 	[ -L "$EXE" ] || break
 	EXE=$(readlink "$EXE")
 done
-#DIR=$(dirname "$EXE")
-DIR=/usr/share/sshuttle
+DIR=$(dirname "$EXE")
 if python2 -V 2>/dev/null; then
 	exec python2 "$DIR/main.py" python2 "$@"
 else