#8 fix for password not being saved

[Craig]

This is a tiny patch that fixes an issue with checkgmail not saving the password on ubuntu 9.04 (and possibly others).
The issue seems to arise when a bluetooth interface (pan0) is enabled but which has a seemingly random HWaddr. This patch ensures that checkgmail only uses the HWaddr from eth or wlan interfaces. It is just a small adjustment to the grep pattern used, but I don't know if it is appropriate for all cases.

This fixes the issue for me, and hopefully will be useful for others too.

[Craig]