[gnome-terminal] help: Deleted pref-app-background.page

[Ekaterina Gerasimova <egerasimov src gnome org>]

commit 556eb52b4148ae1fc7bda214cf6c7f8ba923ad7f
Author: Sindhu S <sindhus live in>
Date:   Wed Feb 6 16:10:19 2013 +0530

    help: Deleted pref-app-background.page
    
    Features for setting background of Terminal do not exist in
    Terminal V 3.7.3 (master), hence this page has been removed.

 help/C/pref-app-background.page |   56 ---------------------------------------
 1 files changed, 0 insertions(+), 56 deletions(-)