[remaster] drop steambox install boot mode

remaster/standard_grub.cfg

@@ -81,15 +81,6 @@ menuentry "Media Center Installation" {
    initrd /boot/sabayon.igz
 }
 
-menuentry "SteamBox Installation" {
-   set gfxpayload=keep
-   echo "Language: ${bootlang}"
-   echo "Keyboard: ${bootkeymap}"
-   echo "Please wait..."
-   linux /boot/sabayon aufs cdroot splash quiet steaminstall vconsole.keymap=${bootkeymap} installer-gui locale=${bootlang} ${modeset_opt} ${acpi_opt} --
-   initrd /boot/sabayon.igz
-}
-
 submenu "Advanced Options" {
 
    menuentry "Console mode" {

remaster/standard_isolinux.cfg

@@ -13,10 +13,6 @@ label mceinstall
   menu label ^Installation (Media Center)
   kernel /boot/sabayon
   append initrd=/boot/sabayon.igz aufs cdroot splash vga=791 quiet installer-gui mceinstall --
-label steaminstall
-  menu label ^Installation (SteamBox)
-  kernel /boot/sabayon
-  append initrd=/boot/sabayon.igz aufs cdroot splash vga=791 quiet installer-gui steaminstall --
 
 label genuine
   menu label Safe ^Mode