Fix wrong product name in the README from the previous commit

(Old svn revision: 7742)

README

@@ -28,6 +28,6 @@ How to report bugs?
 ===================
 
 Bugs should be reported to the Xfce bug tracking system
-(http://bugzilla.xfce.org, product Parole). You will need to
+(http://bugzilla.xfce.org, product xfce4-power-manager). You will need to
 create an account for yourself.
 ( Please attach the output of lshal )