Set color for `bmo be` %presenting mode in i3staplus

dotfiles/config/i3/bin/i3staplus

     case $ovw in
         *%gone)     color=',"color": "#ff0000"' ;;
         *%mtg)      color=',"color": "#ff0000"' ;;
+        *%presenting)   color=',"color": "#ff0000"' ;;
         *%onbreak)  color=',"color": "#33aa55"' ;;
         *%working)  color=',"color": "#cccccc"' ;;
         *)          color='' ;;