Small fix for ratings_gui merge

pwd not used and causes tih serror on xbmc startup
http://pastebin.com/2zNKcwSi
Merge pull request #50 from Kirek/master

Delete unused line that causes error
Update scrobbler.py

VideoExcluded needs to be a global variable.
Merge pull request #51 from Sload89/master

Added VideoExcluded as a global variable in scrobbler.py