installer.kmdr: allow grub installation to gpt disk device which will install it in the bios_grub partition

installer/installer.kmdr

@@ -2258,6 +2258,8 @@ function get_udisks_key_last() {
          if [ "$is_system_internal" == "1" -o "@removablebox.checked" == "1" ]; then
             [ "$partscheme" == "mbr" ] && \
                dcop @dcopid KommanderIf "addListItem(QString,QString,int)" mbrbox "${device:5} (master boot record)" 0
+            [ "$partscheme" == "gpt" ] && \
+               dcop @dcopid KommanderIf "addListItem(QString,QString,int)" mbrbox "${device:5} (bios_grub partition)" 0
          fi
       fi
    done