Update console.py

fix NameError: global name 'log_both' is not defined
Added backup() method to backup shortcuts.vdf before saving it

Fixed comment

Changed backup() to use config file for the location and made it only
possible to backup the shortcuts file
Merge pull request #195 from geraldhumphries/backupshortcuts

Added backup() method to backup shortcuts.vdf before saving it
Merge pull request #185 from Thermionix/patch-2

Update console.py
Aborts backup when file does not exist. Fixes #204
Passes user id as parameter to backup function.