Remove obsolete $mod+o for mocp

Goodbye mocp :'), hello clementine... :)

dotfiles/i3/config

@@ -233,7 +233,6 @@ bindsym $mod+Shift+b        exec "bmo uris -1 | bmo xuris"
 bindsym $mod+Shift+c        exec "bmo uris -1 | bmo xuris -c"
 bindsym $mod+i              exec "bmo menu uris"
 bindsym $mod+Shift+i        exec "bmo menu www_hist"
-bindsym $mod+Shift+o        exec "urxvt -e mocp"
 bindsym $mod+d              exec xbacklight -dec 50
 bindsym $mod+Shift+d        exec xbacklight -inc 25