feat(etl): add update commands to core_getopt

Ensures that the update and check-update commands are available for ET: Legacy by including the etl shortname in the getopt command registration logic.

lgsm/modules/core_getopt.sh

@@ -66,7 +66,7 @@ currentopt=("${cmd_start[@]}" "${cmd_stop[@]}" "${cmd_restart[@]}" "${cmd_monito
 currentopt+=("${cmd_update_linuxgsm[@]}")
 
 # Exclude noupdate games here.
-if [ "${shortname}" == "jk2" ] || [ "${engine}" != "idtech3" ]; then
+if [ "${shortname}" == "jk2" ] || [ "${shortname}" == "etl" ] || [ "${engine}" != "idtech3" ]; then
 	if [ "${shortname}" != "bf1942" ] && [ "${shortname}" != "bfv" ] && [ "${engine}" != "idtech2" ] && [ "${engine}" != "iw2.0" ] && [ "${engine}" != "iw3.0" ] && [ "${engine}" != "quake" ] && [ "${shortname}" != "samp" ] && [ "${shortname}" != "ut2k4" ]; then
 		currentopt+=("${cmd_update[@]}" "${cmd_check_update[@]}")
 		# force update for SteamCMD or Multi Theft Auto only.