init: stop checking for OPENELEC_ARCH

This stops LE's update checker from accepting OE images as system
updates. The checker may be disabled if someone wants to do this.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>

packages/sysutils/busybox/scripts/init

@@ -263,7 +263,7 @@ mount_sysroot() {
 get_project_arch() {
   if [ -f ${1}/etc/os-release ]; then
     . ${1}/etc/os-release
-    echo "${OPENELEC_ARCH:-${LIBREELEC_ARCH}}"
+    echo "${LIBREELEC_ARCH}"
   fi
 }