gluon-autoupdater: remove dead code

Recently the autoupdater contained a case statement to distinguish
between TP-Link WDR3600 and TP-Link WDR4300. This was left over from
previous development versions of autoupdater that relied on the board
name instead of the model. It is thus no longer needed and be removed
safely.

package/gluon-autoupdater/files/usr/sbin/autoupdater

@@ -39,16 +39,6 @@ trap cleanup INT TERM EXIT PIPE
 
 my_model="$(cat /tmp/sysinfo/model | sed 's/ /-/g' | tr '[A-Z]' '[a-z]')"
 
-case "$my_model" in
-  "tl-wdr4300")
-    case "$(tplink_get_hwid)" in
-      "360000"*)
-        my_model="tl-wdr3600"
-        ;;
-    esac
-    ;;
-esac
-
 if [ ! -f "$VERSION_FILE" ]; then
   echo "Couldn't determine firmware version!" >&2
   exit 1