UNIX: Vidalia can't find tor in $PATH.

Actually reproduced under Ubuntu 12.04 with Vidalia 0.2.21

1. make install tor(now tor should be in /usr/local/bin).
2. start Vidalia with default settings(path to tor executable is set to "tor")

I expect: Tor is launched by Vidalia

I get: Vidalia can't find tor.

Possible solution: It looks like there is no need to change a path to absolute in case of UNIX.

I attach a small patch.

Trac:
Username: shamdor